動詞 wear thin:

1. deteriorate through use or stress
   同義詞：wear, wear off, wear out, wear down

1. The teacher's patience began to wear thin when he saw that no one knew the lesson.
   老師發(fā)覺大家對功課一無所知，就漸漸不耐煩起來。
2. As a result, nacre thickness is sometimes just a cosmetic layer that can wear thin over time.
   所以真珠質(zhì)的厚度就像臉上化妝品，不久就會磨薄了。
3. The joke began to wear thin when you heard it too many times.
   這個笑話因為聽得遍數(shù)太多不那么吸引人了。