I’m so glad to read about the changes talking place in your city. It’s really good news that you can travel by subway in Xi’an, though there’s only one line there. Here in London we have twelve lines. By the way, we don’t use the word “subway” here. It’s American English. We call it “the Underground”, instead.

The London Underground is very famous. It’s famous for several reasons. First of all, part of the underground railway today is the oldest in the world, which opened in 1863. Secondly, the London Underground is also the first line to have electric trains, in 1890. Thirdly but not the last, the London Underground is the second largest metro system in the world, after the Shanghai Metro. There are 270 stations in the Underground and it has 402 kilometres of tracks (轨道). What’s more, the city of London itself helps make the transportation system famous! I’ve got a few photos to help you build a clear picture of the Underground in my city. They are together with this mail.

In your email, you also said workers were building more lines. I’m sure your city is developing fast. Maybe you can send me a few photos of your city today. I really want to see the changes taking place there. I’m happy for you to live there in an ancient city with such a new look!

So much for now. I’ll write soon again. Best wishes!

2 . There’s a continuing controversy over whether electric vehicles should produce sounds to let the blind and other pedestrians know they’re on the scene. Some think those sounds should be standardized—like the “beep, beep, beep” of heavy machinery backing up, so you’ll think “something heavy is coming this way” when you hear it — and some think any sound will do.       

This is a serious subject. Plug-in hybrid cars (电混动力车) and battery electric vehicles are super-quiet, and a study at the University of California, Riverside concludes that people listening to recordings on headphones can hear a regular gas car coming from 28 feet away, but a hybrid in battery mode only when it’s 7 feet away.

In response, the European Union has put new rules into play: all new electric vehicle models must have a sound-producing device, which sounds like a traditional engine. Starting in 2021, all new electric vehicles of any model will need the Acoustic Vehicle Alerting System or AVAS. That sound will come into play when the car is traveling backwards or when it’s traveling at less than 12 miles an hour — speeds at which cars are more likely to be mixing with pedestrians.     

That’s a nice start, say representatives for the blind, but more is needed. “We’re calling on the government to take this announcement further by requiring AVAS on all existing electric and hybrid vehicles and ensuring drivers have them switched on,” John Welsman, guide dog owner and Guide Dogs staff member, said in a statement.

Drivers in most cases have the ability to shut off the device when needed. My guess is that they will eventually be standardized so your mind will automatically register “electric car” when you hear it. And that’s probably a good thing to reduce the mayhem (混乱) on the roads.

7 . Backpacking Tour of China

Are you looking for an oriental adventure? Join our 9-day tour and explore China—a country famous for its delicious food, cute pandas and the longest wall in the world! Our China backpacking tour combines history and culture, exciting activities and popular sites.

Day 1—Hong Kong

•Start your adventure at the hotel

•Receive a full introduction from the tour leader

•Board a famous Chinese high-speed train to get to the mainland of China

Day 2 to 4—Chengdu

•Meet your new adventure leader

•Spend the afternoon learning some helpful Mandarin phrases at a free lesson

•Visit the lovable pandas at the Chengdu Research Base of Giant Panda Breeding as they eat their bamboo shoots for breakfast

•Board the night train to Xi’an

Day 5 to 6—Xi’an

•Visit the unmissable Terracotta Warriors

•Cycle around the ancient city’s walls on a bike

•Explore the Bell and Drum Towers

•Experience a Chinese night out

Day 7 to 8—Hangzhou

•Head to the famous West Lake, a UNESCO Heritage Site

Take a boat to one of the islands

•Hike up to Jiuyao Mountain to see the impressive sunset

•Visit China National Tea Museum

Day 9—Macao

•Visit the historic center and spend time at the Venetian Macao Resort Hotel Travel across the sea on a high-speed ship back to Hong Kong, arriving at 20:30.

•Time to say goodbye at the hotel that you started at. Congratulations, you’ve completed your tour of China!

9 . The first time my parents watched me compete in a mountain bike race, they tried to get me to quit. While I was riding down a hill, I hit a huge rock, flew through the air and crashed to the ground. However, this kind of thing happens all the time. I just got up as fast as I could, got back on my bike and kept going. And I won that race, despite taking quite a spill!

My earliest bike memories are of my father taking me out for rides in the child seat on the back of his ten-speed. A couple years later, I got my first bike. But my parents wouldn’t let me ride more than a few blocks from the house until I was ten. The morning of my tenth birthday, I got my older sister to take me on a long ride. We ended up at my aunt’s house. I was totally exhausted and every muscle in my body ached. But I didn’t care. I knew that this was only the beginning, and all I could think about was where my next trip would take me.

When I was in the eighth grade, our gym teacher, Mr. Raines, sent out a flyer about starting a mountain bike club. I ran to his office between classes and signed up. Over the next few months, the ten of us who joined the club worked on our biking skills. Besides taking us out riding, Mr. Raines taught us about bike safety, and showed us how to properly maintain and repair our bikes. He also helped us form a mountain bike team. At first, we competed against each other. Later, we went up against other schools. We continued to train and compete all through high school.

Biking has been the major focus of my life. Those early trips on the back of my father’s bike got me started. The long rides with my sister increased my enthusiasm. Then, the training and competitions in the bike club guaranteed that I would turn into a lifelong bike fan. I think everyone should have a hobby like this－something that is good for them and makes them happy.