作膚淺的探討;淺嘗輒止;隔靴搔癢
牛津電影裡 100%
to deal with, understand, or find out about only a small part of a subject or problem
They scratch the surface and never think
And you're just starting to scratch the surface.
釋義來自《牛津高階英漢雙解詞典》第 9 版