Nowadays, school buses are popular in China. Many students take a school bus to school. It looks like a tourist bus. The undergrounds and common (普通的) buses often take much time. But school buses can save a lot of time. How do children go to school in other countries?

In the US, yellow school buses are a common way for children to go to school. There are about 480,000 school buses in the country. But why are the school buses all yellow? Yellow became the color of school buses in 1939. American educator (教育家) Frank W. Cyr first suggested (建议) it. The color on the buses helped warn other cars: be careful. Black letters on a yellow bus are also easy to see in the early morning.

However, there are not many school buses in the UK. Students from public schools usually take buses or the underground to school. In Japan, schools are not far in cities. So there is no need to use school buses. Children usually walk to school.

Spring is here, and it is time to enjoy West Lake Longjing tea. Usually, we think of workers picking tea leaves by hand. But now, some Longjing tea is being picked by metal workers—tea-picking robots

In a Hangzhou tea garden, a smart tea-picking robot developed by Zhejiang Sci-Tech University set to work for the first time. “We took thousands of pictures of new tea buds (芽) and fed them to the robot for it to learn. The robot uses an AI model to recognize the buds it needs to pick,” said Professor Chen Jianneng, Party branch secretary (党支部书记) of the research team. This lets the robot find the right tea buds about 90 percent of the time.

The robot’s arm pulls and then sucks (吸) up the tea buds. These buds are quickly moved into a special box. After the robot gathers all the buds from the area it’ s working at, it moves the buds from the box to a main box that holds everything it collects. 

The robot was made because there are not enough people to pick tea. In Zhejiang, about 400,000 more pickers are needed now. “Picking is the biggest challenge for the development of the tea industry,” said Professor Wu Chuanyu, who leads the research team.

“Tea-picking robots are a trend (趋势) of the future,” said Wu. In a positive case, about five years from now, the robots will do the job of picking West Lake Longjing tea instead of people, Wu added.

We know health and happiness are important in everyone’s life. Here are some ways to make them easy to get.

★Eat a balanced diet. Eat a lot of fruit and vegetables, some grains (谷物) and a little meat.

★Exercise twice or three times a week.

★Get enough sleep. It is best to get eight hours’ sleep a day.

★Keep yourself busy. This is good because it stops you from having bad habits. To keep yourself busy, you can walk around the house, spend time with your pets, do sports, or have a hobby.

★Go out and make friends. Spend time and have fun with them. Talk with them, but try not to talk about anything bad. You should stay with the people who are healthy and happy themselves.