3 . A few months ago, a friend gifted me a robot sweeper that’s programmed to move around a room and clean as it goes.

When the box arrived, I was afraid the device would detect me and suck up (汲取) data along with the dog hair and dust. But the instructions were easy, and I finally decided not to care.

I powered up the sweeper, watched it leave its docking station to work, and quickly fell in love with my newly shiny floors. I kept shooting its working videos. “I think you’re giving more attention to it than to us,” joked my son.

One day, I returned home and discovered that our front door had blown open and the robot rolled into the yard, trying to clean the flower beds. Even when its brushes were blocked with leaves, bugs and mud, its little wheels bravely kept turning.

The robot acted properly as it was programmed to clean “dirty” things. In a kitchen, dirt can be garden debris (碎片) such as leaves and mud. In a garden, this kind of dirt does not need to be removed. The context is important. The problem for robots is that reading this context is difficult.

This accident inspired me to think more about AI (artificial intelligence). As far as I am concerned, AI is simply well trained and reproduces what it has learned. And it is undeniable that robots are increasingly being given powerful intelligence. Some experts even predict that we will soon see not only AI-enabled robots designed to solve problems according to their instructions, but also those with the ability to judge how they should respond when they are in a different setting.

Maybe this will happen in the near future.

4 . If you spend more than a couple of days in the country of Georgia, you are very likely to be invited to a Georgian feast even by complete strangers. The multi-hour, multi-course feast is one of the most important events in Georgian culture.

A popular Georgian story shows the importance of the feast in Georgian culture. When God created the world, He held a meeting to give the different regions of the world to different cultures. But the Georgians arrived late at the meeting. After they apologized and explained that they’d been holding a feast with a stranger the night before and slept later than they’d meant to, God was so touched and impressed by their honesty that He gave the Georgians the best land of all: the part of earth He was saving for himself.

In order to survive the feasts without offending (冒犯) the hosts, it’s important for you to know a few things about it in advance.

A Georgian feast will likely have a seemingly unlimited number of dishes. So avoid fully cleaning your plate unless you want more servings. Don’t fill up on khachapuri-Georgian cheese bread. There are numerous regional varieties of cheese bread, but khachapuri is the most delicious of all. The cheese bread is usually a heavy lunch on its own, but at feasts it’s often considered a side dish or an appetent. Don’t make the mistake of having more than a few bites—only to discover that the main meal is still coming.

When you drink, follow the lead of the toastmaster, who presents a scries of toasts throughout the evening. Traditionally, drinkers would dry their glass (or, if keeping with tradition, drain their deer’s horn) with every toast. This isn’t always done now. Just remember the important rule: say “cheers” after every toast.

Consider bringing a small gift, such as sweets or flowers, as a gesture of thanks. Avoid bringing more fond, however, which might imply that you don’t think there will be enough on offer.

Xu Xiake was born in 1587.     1     (he) parents were rich landowners. Yet he gave up a     2     (comfort) life, and decided to explore the mountains and rivers on foot.

China has more famous explorers. There was: Zhang Qian, who traveled into Central Asia during the second century BC, opening a trade road that became     3     is known as the Silk Road. Or Zheng He, the sailor who in the 15th century sailed as far away as Africa. Yet these explorations     4     (support) by governments. Xu was totally different.

“On the surface, Xu’s travels can neither be classified as great affairs of state     5     great adventures that changed the course of history,” writes cultural historian Cheng Pei-kai. “Xu travelled to satisfy his own     6     (curious).”

Scholar Julian Ward agrees, describing the lonely Chinese wanderer like the Middle Kingdom’s version of John Muir: “Deep in love with nature and eager to find freedom     7     worldly concerns, Xu was a man addicted to     8     (see) and describing the landscape.”

“The few coins     9     (slip) from a hole in my pocket while I was climbing a mountain in Yunnan. When I finally managed to the town, I sold all my clothes, bought myself a bottle of wine and a good dinner     10     (celebrate) my survival,” the dreamy explorer wrote in his diaries, which mix details of geology, geography and botany with such personal travel experiences.

7 . Via Rail

Train Tickets from New York to Washington

Discount Policies

Seniors (above 60 years old) can benefit from a 20% discount offered by Via Rail, making it a cost-effective choice for their travel needs.

Luggage(行李) Allowance and Restriction

Via Rail allows passengers to bring up to four pieces of luggage. Carry-on items must not exceed (超过) 50 pounds and checked luggage must not weigh more than 50 pounds per item.

Passengers are allowed to bring bicycles and sports equipment on Via Rail trains.

Food and Drink Service

Via Rail provides food and drink service for purchase, offering a variety of dining options to passengers.

Payment

Via Rail accepts various payment methods, including credit cards, Interac Online, and pre-paid credit cards. It is advisable to check the website for the most up-to-date information on accept able payment methods.

Facilities for Passengers with Special Needs

Via Rail is committed to providing accessibility for all passengers. The trains are equipped with accessible restrooms, seating areas, and boarding assistance for passengers with mobility issues. Additionally, staff members are trained to assist passengers with disabilities to ensure a comfortable travel experience.

E-ticketing

Via Rail offers the option to use the e-ticketing system, allowing passengers to present their ticket on a mobile device without the need for printing.

Xixi, located less than five kilometers from the West Lake in the west of Hangzhou, is China’s first national wetland park. The area covers about 10 square kilometers and it     1     (be) around for more than 1,500 years, although it was only recently reopened     2     (offer) visitors a chance to escape from the concrete of the city. Despite its growing popularity,     3     wetland’s winding waterways, thick greenery and wide     4     (variety) of wildlife guarantee its peaceful spots in nature.

Wetlands themselves are one of the most biologically diverse ecosystems,     5     (act) as natural green lungs, water purification (净化) systems and flood control. But wetlands are     6     (serious) threatened by environmental pollution worldwide nowadays. More than 200square kilometers of wetland in the country have disappeared every year     7     average in the past decade, the China Institute for Marine Affairs warns. The wetlands of the Yellow and East China seas have lost up to 90 percent of their natural function, the institute reports,     8     makes the 226 plant species, 50 kinds of fish and aquatic (水生的) animals as well as 126 kinds of birds in Xixi even     9     (valuable).

Xixi’s native vegetation,     10     (water) by six crossing rivers, consists of subtropical mountainous swamp (沼泽) and evergreen forest.

9 . Nowadays, the demand on charities is greater than ever.     1     They create simple but great ideas to help people in need, even when their money is tight. Here’s a perfect example.

Have you heard of the Ice Bucket (桶) Challenge? The social media initiative started in the United States and spread around the world, raising $115 million for the research on ALS (渐冻症) — a disease which Hawking suffered from. You take a video of yourself dumping (倾倒) a bucket of ice water over your head, and then encourage three more people to do the same.     2    

Manju Kalanidhi, a journalist in India, thought it was an amazing way to raise awareness of ALS and raise funds for its research.     3     Water is too precious to waste there, even for a good cause. Then in 2014, it hit her: why not make it a Rice Bucket Challenge to fight hunger?

“    4     I shared it on Facebook and said, ‘This is a Rice Bucket Challenge. Why don’t you do it, too?’” Participants donate a bucket of rice to an individual or family — no, it’s not dumped — take a photo and post it on social media with a message encouraging others to do the same. Or people can donate through a website.

Manju didn’t have a big army of volunteers, but she did have donations and people who need food.     5     To date, Manju says the Rice Bucket Challenge has raised thousands of dollars and distributed an estimated 35,000 kilograms of rice.

10 . We tend to think of large cities as melting pots — places where people from all sorts of backgrounds can mix and interact. But according to new research, people in big cities tend to primarily interact with other individuals in the same socioeconomic bracket (阶层), but people in small cities and rural areas are much more likely to have diverse interactions.

The researchers used GPS data collected in 2017 from 9.6 million cellphones across 382 metropolitan (大都市的) areas in the United States to determine how often people of different socioeconomic ranks crossed paths during the day — essentially how many times people had the opportunity to interact, even briefly, with someone in a different income bracket. They collected data on almost 1.6 billion path-crossings.

This large amount of extremely precise data allowed the researchers to see what has been missed by similar studies in the past. People living in the 10 most populous metropolitan areas, which include cities like New York City, Los Angeles, and Chicago, along with their surrounding areas, were significantly less likely to interact with people of different socioeconomic ranks than people in metropolitan areas with fewer than 100,000 residents.

The good news is that there are ways to build cities to promote more socioeconomic mixing. Looking at large cities, the researchers found that those that placed frequently-visited hubs (中心) in between different neighborhoods — instead of in the center of each neighborhood — were less separated.

“These big cities have managed to develop diverse interactions because the hubs that people visit the most — which turn out to be shopping centers, squares, and similar places — are between rich and poor neighborhoods,” said Hamed Nilforoshan, a doctoral researcher at Stanford University. “Those hubs act as bridges, allowing people to see each other and interact.”