go about one's business   (TTS發音)

mind one's own business；occupy oneself with one's own affairs；stop interfering with the affairs of other people專心于自己的事；不要管別人的閒事

    You'd better go about you own business. 你還是管管自己的事吧。

    I've no time to play chess with you；I've got to go about my business. 我沒有時間跟你下棋，我要幹我的事情了。