have only a superficial understanding (of a subject) ;
I have only a superficial knowledge of the subject.
我对这门学问只是略知皮毛.
I'm only able to scratch the surface.
我只是略知皮毛.
I have only a superficial knowledge of this subject.
我对这个问题仅略知皮毛.
He had only a rudimentary knowledge of French.
他对法语只是略知皮毛。
He has a superficial knowledge of this subject.
他对这门学科略知皮毛.
I know only a little about this matter.
对于这件事,我也只是略知皮毛.
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