... 14 使他们保持干净 keep them clean 15 停止污染它们 stop polluting them 16 问题的答案 the answers to the questions ...
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The oceans are important to all animals on the Earth. We must keep them clean. We must stop polluting them.
海洋对于所有的地球上的动物都有着极其重要的意义。我们要保证清洁，禁止污染。
I think we should figure out some ways to stop people from polluting the river and call on them to fight against pollution.
我认为我们应该要想出一些办法来阻止人们污染这条河，并号召人们同污染做斗争。
Why not stop them (from) polluting the river?
为什么不阻止他们污染这条河呢？
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