天花板上的一块灰皮掉下来落到他的头上。

A piece of plaster from the ceiling fell on his head.

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皮板由于柠檬汁酸性溶液的浸泡而浸透。

The leather disk had been soaked in a mild acid solution of lemon juice.

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皮板由于柠檬汁酸性溶液的浸泡而浸透。

The leather disk had been soaked in a mild acid solution of lemon juice.

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