正文

VOA慢速英语:NASA to Study Astronaut on Yearlong Mission in Space

2015-03-27来源:VOA

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词汇讲解：

1. challenge n.挑战; 盘问
例句：They offer little challenge or autonomy.
它们没有什么战斗性或主动权。

2. revisit vt.重游; 再访
例句：He determined to revisit the scene of the last evening's gambol.
他决计再到昨晚嬉戏的地方去一趟。

3. produce vt. 生产; 产生
例句：Hard work and enthusiasm can produce success.
努力工作及热忱会导致成功。

4. effect n.影响; 效果
例句：In winter the effect was found to be insignificant.
在冬季，这种作用是不明显的。