请问drop off 的中文意思是什么啊

问题描述:

请问drop off 的中文意思是什么啊

1.fall off掉下My top button has dropped off and I cann't find it.我最上面的钮扣掉了,找不到了.2.become fewer or less;decline 减少;下降The number of students has been dropping off recently.近来学...