You should turn the light on at dark.

天黑时你应开灯.

《简明英汉词典》

The hunters camped by the lake at dark.

天黑时,猎人们在湖边宿营.

辞典例句

They at the village at dark, with the boy leading the way.

由这个男孩子带路,他们天黑时到达了村庄.

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The bar street has many customers even at dark nights.

酒吧一条街的生意在深夜都很好.

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They turn the light on at dark.

他们在黄昏时开灯.

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This Photo Was Taken at Dark or Dawn?

这张照片是在黄昏拍摄的还是在黎明拍摄的?

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Look at dark cloud. It looks like rain.

看看那乌云, 好像要下雨了.

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Everytime i see your face at dark.

每次我看到你的脸在黑暗.

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Have very real one words: Will never know US at dark night in the daytime!

有一句很现实的话: 白天永远不懂黑夜的美!

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