...the erosion of moral standards.道德沦丧More familiar landscapes have been sculpted by surface erosion.还有更多熟悉的地貌是因地表侵蚀形成的。Abrasion also abets wind erosion.磨损作用也助长了风的侵蚀.As their roots are strong and penetrating, they preven...
Librarians spend a lot of time classifying books.图书馆工作人员花许多时间将书分类。The students and the librarians query for books beyond the current list.同学和图书管理员询问现有书目以外的书籍.The teachers and librarians of ancient Alexandria did it.古代亚历山...