After a dark night, the sun will rise.

黑夜过后，太阳会升起。

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The men and the women had to do all their work before sunset. After the sun went down, it was too dark to do farm work or housework.

男人和女人必须在太阳下山前做完所有的工作， 太阳下山后， 天就黑了， 不能再做农活和家务了。

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Past research shows that people naturally end up sleeping longer when the sun sets earlier, for example in the winter, even if the person goes to bed well after dark.

过去的研究显示，当日落较早时，人们的睡眠会自然而然变长，即使是天黑很久后才睡觉也一样，比如冬季时。

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