But most libraries have a book drop off slot on the outside of the library.

但是大多数图书馆在图书馆外面都有一个还书处。

Dr Carrol is the author of a new book, 'Dropping the Mic and Jumping the Shark: Where Do Modern Idioms Come From? '.

卡罗尔博士是新书《扔麦和剧情走下坡路：现代习语从何而来》的作者。

Often enough I pass an hour in mere drowsing by the fireside; frequently I let my book drop, satisfied to muse.

我经常在炉边打瞌睡就度过一个小时； 我经常放下书本， 满足于沉思。