walk-in
adjective [ before noun ] uk/ˈwɔːk.ɪn/ us/ˈwɑːk.ɪn/
(STORAGE)
（存储空间）大得人能走进去的，步入式的
used to refer to a space used for storing things that is large enough for a person to enter and walk around in
a walk-in wardrobe 步入式衣橱，衣帽间
a walk-in refrigerator 步入式冰箱
(NOT ARRANGED)
mainly US无需提前预约的
used to refer to a place that you can go to without having already made an arrangement
It's a walk-in dental clinic. 这是一家无需提前预约的牙科诊所。