scratch the surface

• vt. 触及表面；肤浅的探讨；处于初步阶段有待深入研究

例句

用作及物动词 (vt.)

1. This is a superficial assessment to say the least.
   退一步说这是一个肤浅的评价。
2. This essay is so short that it can only scratch the surface of the topic.
   这篇文章很短，只能对这一问题作肤浅的探讨。