smug

adj.

自鸣得意的；自以为是的；整洁的；体面的

n.

自命不凡的人，沾沾自喜的人；书呆子；

1. You've got nothing to be smug about.
   你有什么值得自鸣得意的。
2. He needn't be so smug, I know something he didn't know.
   他用不着那么沾沾自喜，我懂得某些他不懂得的东西。

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