His toupee dropped off, revealing his bald head.

他的假发掉了、，露出了光头。

柯林斯例句

When he grew bald he bought a toupee.

头发掉了后,他买了一顶假发.

《简明英汉词典》

One more thing: While I was writing that last paragraph, the nurse straightened my toupee.

还有件事: 我写最后一段的时候, 护士正了正我的假发.

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