Pluck not a courtesy in the bud.

不要在萌芽时就摘取礼貌。

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Life is short, but there is always time enough for courtesy.

人生苦短,但总有足够的时间来礼貌待人。

Courtesy is only a thin veneer on the general selfishness.

礼貌只是一般自私的表面现象。