下面再给大家一段文字来体会类比的妙用。

　　It is unrealistic to expect individual nations to make, independently, the sacrifices necessary to conserve energy. International leadership and worldwide cooperation are essential if we expect to protect the world s energy resources for future generations.

　　Another reason why an international effort is required is that other problems of an international nature have also required global cooperation. For example, has each nation independently recognized the folly of nuclear weapons proliferation and voluntarily disarmed? No. Only by way of an international effort, based largely on coercion of strong leaders against detractors， along with an appeal to self-interest, have we made some progress. By the same token, efforts of individual nations to thwart international drug trafficking have proven largely futile, because efforts have not been internationally based. Similarly, the problem of energy conservation transcends national borders in that either all nations must cooperate, or all will ultimately suffer.

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