he did not look up from his desk when I entered中的look

问题描述:

he did not look up from his desk when I entered中的look

这里的look up是“抬头看……”的意思.
He did not look up from his desk when I entered.
我进来时,他头也没抬.也就是说这里的look和up不是一个词组,而是分开的?恩,没错。是分开的。

p.s. look up这个组合,作为词组的意思是”v. 查找“,但这里用作分开的look + up向上看、抬头看的意思。:)