mind one's own business   (TTS發音)

attend to one's own duties and not interfere with those of others不要多管閒事

    You had better mind your own business. 你最好少管閒事。

    “How's that new contract with Smith coming on？”“Mind your own business！”“同史密斯訂的新合同怎麼樣了？”“少管閒事！”