witticism [ˈwɪtɪsɪzəm]

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n.谐语，妙语

a remark that is both clever and humorous

He tries to lighten his lectures with an occasional witticism. 他有时想用俏皮话使课堂活跃。
His witticism was as sharp as a marble. 他的打趣话十分枯燥无味。