劍橋詞典used to describe a place where people can go, usually to get help or advice , at any time without making an appointment (= an agreed date and time ) （咨詢、服務(wù)中心等）不用預(yù)約的 a drop-in centre for the homeless 為無(wú)家可歸人士提供的開放中心 a drop-in clinic /shelter 無(wú)須預(yù)約診所/開放式庇護(hù)所 返回 drop-in