Bats are the only “flying animals” in the world. They can't see very well. We often hear “as blind as a bat”. Yet they have no trouble flying on the darkest nights and finding their ways round. How can bats fly and see at night? They fly by radar(雷达).

The bat's radar system(系统) works the same way as the radar in ships and planes. As a bat flies through the air, it makes a sound. If the sound hits things, it will come back and the bat's ears will receive the message. In this way the bat is able to know where the things are. Bats go out for food at night. In the daytime they hang in some dark places. Some people think bats are bad animals. In fact they are useful animals.

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    ChaiJing, who worked for China Central Television (CCTV) from 2001 to 2013 as a TV reporter made a documentary(纪录片) named under the Dome （穹顶之下）to educate the public about smog. It is released（发行）online on March 1^st, 2015.

    In the opening of the documentary, Chai tells the story of her daughter with a begin tumor （良性肿瘤）before her birth. “ I couldn't help worrying while seeing the polluted sky in Beijing,” she says. She only took her daughter outside when the air in Beijing was good. The rest of the time she had to keep her at home like a “prisoner（囚犯）”. And there were175 polluted days in 2014 in Beijing.

    In the  documentary, Chai had an interview with a six-year-old girl, WangHuiqin, who live in Shanxi Province, a heavily polluted area in China. The girl told Chai that she had never seen stars, blue skies or white clouds in her village.

    Chai also went to London and Los Angeles, which had both suffered air pollution in the past, to learn how they had improved their environment.

    Chai spent one year making this 103-minute film, which cost her over 1 million yuan. In the documentary, Chai tries to answer three questions. They are “ What is smog”, “ Where does it come from?” and “What should people do?” And she calls on everyone to get into the fight against smog.

    The earth moves round the sun, and the moon goes round the earth. When our part（部分） of the earth turns to the sun, it is day, When our part of the earth turns away from the sun, it is night. The sun is much bigger than the moon. But sometimes the moon looks bigger than the sun, because it's much nearer to the earth. The sun is very bright. It gives a very strong light. The moon looks quite bright, too. But it doesn't give any light at all. The moon looks much bigger and brighter than the stars .But actually（事实上）, the stars are much bigger and brighter than the moon. They look smaller than the moon because they're much farther away from us.

    When you are on a long road trip or in a traffic jam during a daily-commute ， it may seem harmless to connect your phone to your car's USB port．But unless you really need to use your phone，charging(充电)your iphone during your commute could be a big mistake．

    Why? For starters，the USB port in our car probably provides less electricity than your phone really needs to charge．As a result，your phone might stop working while it charges.

    Many people may notice that on their way home from work their phone charged very little during their 30-60 minute commute，"says Brad Nichols，an engineer at Staymobile．"It is mostly because that the phone is using more power than the car charger isproviding it．"

    Nichols also says that your phone could receive too much power，especially if you are using a cigarette lighter port to charge up．Most cigarette lighters can provide more power than most chargers can afford．If a charger cannot keep providing the proper power, it may make the phone broken．

    Charging your phone could do harm to your car's battery(电池)，too．This usually isn't a big deal for those who own new cars with healthy batteries，Nichols says．But if your car is older，you might not want to charge your phone through its USB port．

    Most importantly，it's not safe to use your phone while driving．"Anytime a person's hands leave the wheel or eyes leave the road，it becomes dangerous for them and the other people around them," Nichols points out．Bottom line：Play it safe，and wait until you get home to charge your phone．