These are the faces of black soldiers during the American Civil War.

这些是美国内战期间黑人战士的面孔。

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During the war we had to black out all our Windows.

战时我们必须用黑布遮着窗口以免透光。

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They bought butter on the black market during the war.

战时，他们在黑市上买黄油。

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They bought butter on the black market during the war.

战时，他们在黑市上买黄油。

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