慢速英语:World Leaders to Sign Climate Agreement on Earth Day

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1. demonstrate vt.论证; 证明，证实; 显示
例句：We shall use it to demonstrate the nonplanarity of K5.
我们用它来揭示K5的非平面性。

2. celebrate vt.庆祝; 祝贺; 举行宗教庆典; 歌颂
例句：He took up the rug, to celebrate their diligence and taste.
他拿过沙发毯，夸奖了她们的勤奋和雅兴。

3. enforceable adj.可强行的，可强迫的
例句：Contracts are enforceable by law.
各种契约都由法律执行。

4. represent vt.表现，象征; 代表
例句：Mr. Reed has been selected to represent us on the committee.
里德先生代表我们已被选入委员会。

5. ratify vt.批准; 认可
例句：The government of Honduras refused to ratify the convention.
洪都拉斯政府拒不批准该约。