Trees help keep the air clean and they make oxygen that we can breathe.
树木有助于净化空气，释放出可供我们呼吸的氧气。
Are they the people who help to keep the environment clean?
他们是帮助保持环境干净的人们吗？
Friends of the Earth help to keep the environment clean.
地球的朋友帮助保持环境干净。
"It's a pleasant way to help keep our city clean," said my friend.
“这是一种令人愉快的方法，有助于保持我们城市清洁的方法。”朋友说。
它们帮助保持空气干净。
All they want to do is help you keep your teeth healthy and clean.
他们是尽力帮助你保持牙齿健康和清洁的人。
I help to keep the floor clean when I sweep.
我打扫卫生时，把地板清扫干净。
Help keep the kitchen clean. Eat out.
要想保持厨房整洁。就外出就餐吧。
It might help a little if only you would keep clean.
只要你愿意保持清洁，可能就会好一点。
Help keep the kitchen clean - eat out.
帮助保持厨房洁净—出去吃。
They are encouraged to use bicycles, which are thought to help keep the air clean.
鼓励人们使用有助空气清洁的自行车。
Help us to keep the train clean.
请协助我们，保持火车清洁卫生。
It's a good way to help keep our city clean.
这是保持我们城市清洁的一个好办法。
Friends of the Earth help keep the environment clean.
地球之友协助保持环境清洁。
Please help us keep it clean and attractive.
请协助我们保持站区清洁。
Trees help keep the air clean.
树木有助于空气保持清新。
It's a pleasant way to help keep our city clean and tidy.
那是一种有利于保持我们城市清洁的办法。
First, I can help to keep our city clean and beautiful.
首先，我要让我们的城市保持干净和整洁。
First, I can help to keep our city clean and beautiful.
首先，我要让我们的城市保持干净和整洁。
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