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The bats are balancing the need to wait until dark, when day-flying hawks stop hunting, and the need to catch the insects when they are most plentiful, right at dusk.

弗里克指出，蝙蝠在平衡两种需求，一种是等待夜幕的降临，为了躲避那些白天捕食的鹰；另一种是捕捉昆虫的需求，它们往往在傍晚很丰富。

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They didn't reach the border until after dark.

他们天黑以后才到达边境。

《牛津词典》

The twenty-two men rested until dark, listening to rain hit the roof of the farm house.

VOA: special.2009.06.18

Mr Quinlan says his new krewe will keep revellers on the streets, spending money until dark.

ECONOMIST: Mardi Gras

Barrie's "Peter Pan in Kensington Gardens" (1906) that shows fairies hiding until dark under a huge tree.

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He is currently starring on Broadway in a revival of the thriller "Wait Until Dark" and has received scathing reviews for his performance.

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