英语单词 drop 和 droop 有什么区别?

drop in at 和drop in to 有什么区别 drop by 和drop at 有什么区别? drop in 和 drop by有什么区别啊? a drop of water 和a drop to water有什么区别 drop into和throw into有什么区别 drop in on 与drop by有什么区别 请问drop in on 与drop by有什么区别 drop in at和drop in to到底什么区别drop in drop in 和drop in on用法有什么不同 drop off 和drop from区别 drop by 和 drop on的区别 drop in和drop by的区别