1. 落入：drop in 顺便走访 | drop into 落入 | drop off 离开

2. 开进：drop inbound pilot 进港引水员下船 | drop into 开进 | drop keel 滑动龙骨;下垂龙骨

3. 拜访：upgrade n. 升级, 提升, 改良 | drop into 拜访 | cosmetic adj. 化妆的, 美容的

4. 把......扔到：enjoy the view 赏风景 | drop ... into ... 把......扔到...... | speed down 快速下滑