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。

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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。

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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。

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When darkness fell we heard the mothers scream.

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Thus, when darkness fell that day, a more terrible prospect loomed into view - that unless we are vigilant and prepared, even small actors in the world can inflict catastrophic harm on the United States.

CNN: Thompson's November 13, 2007, speech to The Citadel