Pollution is threatening marine life.

　　污染正危及海洋生物。

　　We are taking steps to prevent pollution.

　　我們正在采取措施防止污染。

　　Steps are to be taken to abate pollution.

　　應該采取措施減少污染。

　　Pollution is still very much a live issue.

　　污染仍然是目前非常讓人關(guān)注的問題。

　　Cars cause pollution, both smog and acid rain.

　　汽車引起污染，既有煙霧又有酸雨。