皮红色书皮儿的那本书是我的用英文翻译（定语从句）

这句话是由两部分构成的：

1、[那本书是我的] That book is mine.
2、[该书对封皮是红色的] The cover of the book is red.

把第二句与第一句 that book 意思重复的 the book 改为关系代词 which变成定语从句 That book (the cover of which is red) is mine。

也可以把 the cover of which 用同义词 whose cover替换， 改为 That book (whose cover is red) is mine。

你好！
皮红色书皮儿的那本书是我的
Skin peels red book that book is mine

the book whose cover is red belongs to me