HSK 7-9
潜水
qiánshuǐ动
to dive; to go under water; (in an online forum) to lurk
我们清晨出海潜水。
Wǒmen qīngchén chūhǎi qiánshuǐ.
We went out to sea to dive early in the morning.
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Appears across levels (7-9) in the HSK 3.0 word list.