scratch the surface
成語所屬單字scratch
scratch the surface — 慣用語
1. to deal with or understand only a small part of a subject or problem, leaving mo
1.慣用語
釋義
觸及皮毛；僅觸及表面
to deal with or understand only a small part of a subject or problem, leaving most of it still to be explored
例句
The two-hour lecture only scratched the surface of the history of Chinese medicine.
Our investigation has barely scratched the surface of what went wrong at the factory.