have your nose in a book并不是鼻子放在书本里，而是用来表达一个人埋头苦读，很勤奋的那股劲儿。

【例句】
I would rather have my nose in a book than playing with other kids outside.
我更喜欢自己埋头读书，而不是和其他小孩一起在外面玩耍。

She always has her nose in a book.
她总是埋头看书。