mind/watch your manners idiom
（努力）保持礼貌
to make a special effort to be polite
His mother taught him to always mind his manners with his elders. 他妈妈教他在和长辈相处时要保持礼貌。
You're in my house so you'd better watch your manners. 你在我家里，最好举止端正点。
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