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1·They embarked the troops by night.

他们让部队在夜里上了船。《牛津词典》

2·They sleep by day and hunt by night.

他们白天睡觉，夜晚捕猎。《牛津词典》

3·By night, the perimeter wire was illumined by lights.

夜晚，周遭的铁丝网都被灯光照亮。《柯林斯英汉双解大词典》

4·One more wail would go the round in that wind by night.

到了晚上，在那样的狂风中，还会传来一声哀号。

5·Nocturnal animals sleep by day and hunt by night.

夜间活动的动物白天睡觉晚上猎食。《牛津词典》

6·Many animals hunt by night.

许多动物在夜间猎食。

7·The sun shines by day, and the moon shines by night.

太阳在白天光芒万丈，月亮在夜晚明亮；

8·He was standing there by night like one intent on doing evil.

他大晚上的站在那里，好像一个打算要做坏事的人。

9·Deep-sea fish and whales have little or no light by day or by night.

深海鱼类和鲸鱼在白天或晚上都几乎不会接触光线。

10·It involves a prince who is a white bear by night and a human by day.

其中有一位白天是人、晚上是白熊的王子。