The whole idea behind the US National Parks system was to preserve natural and historic locations, and the wildlife that lives there. That goal allows for inclusion of anyplace that features natural beauty, unique geological features, or an interesting ecosystem,plus the sites of national monuments and other places of historical or archaeological significance.

We've selected three US National Parks that are as different from each other as possible. Let's start in the Northeastern corner of the US, with a beautiful park called Acadia.

Acadia National Park

Acadia National Park is in Eastern Maine, near the town of Bar Harbor. The park is unique, in that it features a wide variety of landscapes, including mountains, ocean coastline, woodlands, lakes, and wetlands. It covers a total of 49,075 acres.

The park is home to 37 species of mammals, including black bears, moose, and deer. There are 33 fish species and 331 bird varieties.

Everglades National Park

Unlike many national parks, Everglades National Park was initially created to protect a fragile and disappearing ecosystem. The Everglades consist of a network of wetlands and forests that are fed by a river flowing slowly out of Lake Okeechobee.

The Everglades cover a massive area, and Everglades National Park protects only the southern twenty percent. It's the United States' largest tropical( 热带的) wilderness;in fact,it's the largest wilderness of any kind east of the Mississippi River.

Hawaii Volcanoes National Park

Hawaii Volcanoes National Park is located on "the big island", Hawaii. It was created in 1916. The park features two active volcanoes, one of which, Mauna Loa, is the world's largest shield volcano. The other, Kilauea, is one of the world's most active volcanoes.

Hawaii Volcanoes National Park lets visitors get up close and personal with the two volcanoes.Odd-looking lava(岩浆）fields and dramatic landscapes captivate the eye,and you can learn about the rare plants and animals that thrive in the tough environment.

A lot of people ask this question: "Why is body language so important?" Studies have shown that in the process of communication, non-verbal expression has 65% to 93% more influence than actual text. This means that "how to say" is more important than "what to say". Of course, this does not mean that you don't need to do preparation for your interviews, nor does it mean that you can take any short cuts. On the contrary, this means that you have more things to pay attention to and prepare for.

In the real workplace, body language is much more important than you think. Without proper body language, you may find yourself trapped in a circle where you can't integrate with the external environment, not to mention the difficulties in the absence of body language in the workplace.

"People can often make inferences from actions, and the results of these inferences directly affect lives: for example. who will be employed and who will be promoted."Academician Amy Cuddy said in a TV talk show. She also said that "our body language will also affect our perception ( 感知, 看法)of ourselves. When you try to make more authoritative actions,your brain will inadvertently（不经意地）receive signals and actually create an idea that you are more authoritative, so that you have more confidence in yourself".

Therefore, before interviews or important meetings, try not to lean on any object or have a hunched back. Instead, you should try to keep your body relaxed. You can even stand with a relatively authoritative posture (姿势） -of course, you may need to do these things in the bathroom or places where no one could see you.

Body language plays a crucial role in your job interviews, careers, and everyday life. Paying attention to body language could make strong impacts on your behavior,which could help you achieve better results. So, every time you are nervous or feel that you can't do it, stretch your body, smile, and tell yourself "Fake it till you become it!"

Compared with some other parts of the world, Canada is not a country with a lot of particularly flashy traditions - which isn't to say none exist. In general, it's the aging process, and the various "key dates" that occur as a Canadian moves from babyhood to adulthood that tend to be the most celebrated and ritualized(仪式化了的）moments in mainstream Canadian culture.

Canadian couples will generally announce their pregnancy with great pride to friends and family as soon as they're aware, and it's common for girlfriends of the expecting mother to organize a baby shower-a small, lighthearted house party - to honour the new mom sometime before she gives birth. Shortly after the child is born, it's similarly customary for friends of the parents to visit and give at least one baby gift, usually a toy or clothes, to express congratulations.

If there's one thing Canadians love celebrating,it's the anniversary(周年纪念日)of their own birth. In recent years, birthdays have risen to become one of the most tradition-rich spectacles of Canadian culture. During childhood, most parents will arrange birthday parties for their children on the special day (or the closest available weekend), a fun excuse for the birthday boy or girl to gather up all their schoolyard friends and spend the afternoon hanging out. In their teenage years and adulthood, they begin to assume greater control over their own birthday plans.

Completing a phase of school in Canada is almost always celebrated with a fancy graduation ceremony. In their final year of high school (and sometimes middle school as well), students will celebrate the completion of their studies with some sort of party organized by the school, usually known as "grad night". These usually take the form of a fancy dress gala(庆典，盛会,演出）held at a local hotel, complete with a dinner, dancing and lots of awkwardly-posed photographs.

With the commercial sale of its AI-enabled precision spraying(喷洒）technology to a large farming operation in Israel, Greeneye Technology has reached a major milestone in its mission to significantly reduce herbicide(除草剂）use in agriculture,increasing productivity and profitability for farmers.

This is the first stage in the company's global rollout, which will continue in early2022 with its launch in the US market. Initially, Greeneye plans to work with corn and soybean farmers in the Midwest and will increase availability to other states in 2023.Within days of announcing its early adopter program in the US,the company was oversubscribed, indicating the growing interest from farmers for a commercially viable precision spraying solution.

Backed by Syngenta,Greeneye says its precision spraying technology has been proven to cut herbicide use by 78% and reduce herbicide costs by more than 50%(average figures),while also improving weed control efficacy(功效,效力）compared to traditional broadcast spraying. This is achieved through Al technology that can detect and spray weeds in crops with 95.7% accuracy.

"Weeds represent one of the greatest threats to global crop production," says Nadav Bocher, CEO of Grceneye Technology. In the US alone, they are estimated to cost farmers more than $ 33 billion annually. Today, farmers address this challenge by spraying herbicides across the entire field. As a result, not only are farmers spending far more money on herbicides than they need to, but millions of gallons of herbicides are being needlessly sprayed each year. This is contributing to the mounting challenges posed by herbicide-resistant weeds and worse still, polluted soil and water.

"We are incredibly proud to announce the commercial launch of our precision spraying technology, but reducing herbicide use is just the beginning," Bocher says."The next generation of our technology,which is already in development, will also be capable of precisely spraying chemicals."

"At the same time, our Al capabilities enable us to collect ultra-high-resolution data from the entire field, providing valuable insights to farmers. With this information at our fingertips, Greeneye is positioned to guide the global agriculture industry toward a more sustainable –and profitable future."