HSK 7-9
冰山一角
bīngshān-yìjiǎotip of the iceberg
这份资料只是问题的冰山一角。
Zhè fèn zī liào zhǐ shì wèn tí de bīng shān yì jiǎo.
This material reveals only the tip of the iceberg.
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Appears across levels (7-9) in the HSK 3.0 word list.