have one's nose in a book连鼻子都埋进了书本里，那是多么专心地在看书！所以这个短语就是"埋头看书，一直在看书"的意思。例句：Bob has his nose in a book every time I see him. 我每次看到鲍勃他都在看书。His nose is always in a book. He never gets any exercise. 他总是在看书，从来不锻炼。（这样可不好，生命在于运动，还是要注意锻炼身体哟！）
