books 是book的 复数。

是名词，可以放在句首、句中或句尾。例如： Books are essential for our life. My mom bought some books for me yesterday. I want to have some books.

1、书( book的名词复数 )；卷；课本；账簿

2、预订( book的第三人称单数 )；登记；（向旅馆、饭店、戏院等）预约；立案（控告某人）