(US)or USmiss the forest for the treesor Britishnot see the wood for the trees
:to not understand or appreciate a larger situation, problem, etc., because you are considering only a few parts of it只见树木不见森林
This investment would be good for the company, but he's so concerned about saving money that he can't see the forest for the trees.投资将给公司带来好处，但是他只见树木不见森林，就知道攒钱。