Before scientists discovered the cause of the total eclipse of the sun, people were extremely frightened when darkness fell in the middle of the day.
科学家发现产生日全蚀这一现象的原因之前，每当黑暗在大白天降临时人们就怕得要命。
Recent surveys show that Americans sleep seven hours each night on average, down from nine hours in 1910, when, without electricity, people generally went to sleep as darkness fell.
近期一项调查显示美国人每晚平均睡眠7小时，比1910年的9小时有所下降，而当时应为没有电，人们总是日落而息。
And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him.
日头正落的时候，亚伯兰沉沉地睡了。忽然有惊人的大黑暗落在他身上。
When we had trudged along for several hours, in silence, the darkness fell, and the stars began to come out.
当我们默默地走了好几个小时以后，天黑了下来，星星开始发出光亮。
The quake struck Sichuan Province and neighboring regions at 2:28 p. m. on May 12, 2008, when Xue was having a chemistry class. The floor disappeared from under him and he fell into darkness.
2008年5月12日下午2：28，四川省及其周边地区发生重大地震，地面垮塌，正在上化学课的薛枭被被埋在一片黑暗之中。
The quake struck Sichuan Province and neighboring regions at 2:28 p. m. on May 12, 2008, when Xue was having a chemistry class. The floor disappeared from under him and he fell into darkness.
2008年5月12日下午2：28，四川省及其周边地区发生重大地震，地面垮塌，正在上化学课的薛枭被被埋在一片黑暗之中。
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