the tip of the iceberg
US /ðə tɪp əv ði ˈaɪs.bɜːɡ/
UK /ðə tɪp əv ði ˈaɪs.bɜːɡ/

1.
冰山一角
only a small, visible part of a much larger, hidden problem or situation
:
•
The recent scandal is just the tip of the iceberg; there's much more corruption to uncover.
最近的醜聞只是冰山一角;還有更多的腐敗有待揭露。
•
His current financial troubles are just the tip of the iceberg of his deeper debt problems.
他目前的財務困境只是他更深層債務問題的冰山一角。