a small tube-shaped part that is joined to the intestines on the right side of the body and has no use in humans

She had her appendix out (= medically removed) last summer. 去年夏天她做了阑尾切除手术。

a separate part at the end of a book or magazine that gives extra information

There's an appendix at the end of the book with a list of dates. 书后有一个附录，列有年代日期。