drop by in顺便访问
drop-in substitute随手可得的代用品
Drop-in Center收容中心
Drop - in Visitors不速之客
drop-in office急诊处
information drop-in信息混入
Drop-in Visitors不速之客
window drop-in叠印框
drop-in tool投入工具
PHRASAL VERB(动词词组) If you drop in on someone, you visit them informally, usually without having arranged it. 顺道拜访
Why not drop in for a chat?
为何不顺道过来聊聊?