1·We need more laws to stop pollution.
我们需要制定更多法律来防止污染。
—— 《牛津词典》
2·Steps are to be taken to abate pollution.
应该采取措施减少污染。
—— 《牛津词典》
3·We are taking steps to prevent pollution.
我们正在采取措施防止污染。
—— 《牛津词典》
4·Cars cause pollution, both smog and acid rain.
汽车引起污染,既有烟雾又有酸雨。
—— 《柯林斯英汉双解大词典》
5·The level of pollution in the river was falling.
该河流受污染的程度其时正在降低。
—— 《柯林斯英汉双解大词典》