know how to behave in a delicate situation;be sensible;be tactful;know one's place ;

I was very discreet and didn't disturb you, just to see when you'd speak to me. "
我知趣得很,决不打搅你, 看你什么时候跟我说话. ”
来源:汉英文学 - 围城Any human who sees them on the horizon does well head the other way.
任何在地平线上看到它们的人类都应当赶紧知趣地离开.
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