以下为句子列表：
英文: As a result, nacre thickness is sometimes just a cosmetic layer that can wear thin over time.
中文: 所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。
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英文: The joke began to wear thin when you heard it too many times.
中文: 这个笑话因为听得遍数太多不那么吸引人了。
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英文: The teacher's patience began to wear thin when he saw that no one knew the lesson.
中文: 老师发觉大家对功课一无所知，就渐渐不耐烦起来。
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