You cannot see the wood for the trees.

你们只见树木，不见森林。

One cannot see the wood for the trees.

不能只见树木不见林。

Some people cannot see the wood for the trees.

有些人只见树木不见森林。

Teachers sometimes notice language errors and do not see the good ideas in a composition; they cannot see the wood for the trees.

老师们批改作文时，时常只注意到语言错误，而不注意文章的思想，真是因上失大。