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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