慢速英语:Groups Seek to Ban Smoking at U.S. Colleges and Public Housing

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1. announce vi. 宣布参加竞选; 当播音员
例句：He will announce tonight that he is resigning from office
他将于今晚宣布辞职。

2. oppose vt.抵制; 反对，抗争
例句：Mr Taylor was not bitter towards those who had opposed him
泰勒先生对那些曾反对过他的人并未怀恨在心。

3. estimate vt. 估计，估算; 评价，评论
例句：You estimate his intellect too highly.
你把他的智力评估得太高。

4. urge vt.催促; 推进，驱策
例句：They urged parliament to approve plans for their reform programme
他们敦促议会批准他们的改革方案。

5. approximately adv.近似地，大约
例句：In the course of the 1930s steel production in Britain approximately doubled
在20世纪30年代，英国的钢铁产量几乎翻了一番。