Please make yourself at home.
请不要客气。
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今天的几个句子是有关礼貌的:1.Have a seat, and make yourself at home. 请坐。请不要客气。2.There is
plenty for everyone, so help yourself! 这儿有很多,足够每个人吃,所以不要客气!3.If you want to
borrow the car, be my guest. 如果你要借那辆车,请不要客气。