關鍵句型一：表示"構成危害"的句型

　　1. Pollution has become a serious problem to all the nations of the world.

　　2. Pollution has become a great risk to our earth.

　　3. Pollution is a danger to us all.

　　4. Pollution is a threat to mankind.

　　5. Pollution has threatened our lives greatly.

　　6. Pollution has brought great to human beings.

　　7. Pollution troubles / vexes / irritates us no end.

     關鍵句型二：表示"采取措施"的句型

　　1. Something must be done to tackle the problem.

　　2. We've got to do something about pollution right away.

　　3. We must take action now to control pollution.

　　4. We have to take effective measures to solve this problem.

　　5. We should adopt some measures to fight against pollution.

　　6. It's time to take steps to control the increasingly serious pollution.

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