Mind your manners — it is impolite to have no manners.

注意你的礼貌——这样不讲礼貌是不好的。

youdao

I see kids [on the spectrum] today that have no manners. That's going to hurt them.

我见到过现在[在谱系障碍内]的没有任何礼貌的孩子 这将会使他们受到伤害。

youdao

He has old-fashioned good manners and treats voters like adults, admitting when problems have no simple solution.

ECONOMIST: Bagehot