剑桥词典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 ) （咨询、服务中心等）不用预约的 a drop-in centre for the homeless 为无家可归人士提供的开放中心 a drop-in clinic /shelter 无须预约诊所/开放式庇护所 返回 drop-in