例句：Kevin stopped to buy the evening paper from a news vendor.
      凯文停下来向报贩买了一份晚报。

2.mainstream n.(思想或行为的)主流

例句：Their views lie outside the mainstream of current medical opinion.
      他们的观点不属于当今医学界观点的主流。

3.impeachment n.弹劾

例句：The verdict resulting from his impeachment destroyed his political career.
      他遭弹劾后得到的判决毁了他的政治生涯。

4.periodically adv.周期性地

例句：Economic crises recur periodically.
      经济危机周期性地发生。

5.perform v.表演; 扮演

例句：He performed well under pressure.
      他在压力之下表现得很好。
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