able to be visited without arranging a fixed time first 可随时造访的;无须预约的 There is a drop-in clinic every Tuesday offering advice on sexual health. 每周二都有一个上门诊所,提供关于性健康的建议。 a drop-in yoga class 顺便去上瑜伽课 drop-in daycare 顺便去托儿所
Oxford Collocations DictionaryDrop-in is used with these nouns:- session