HSK 7-9
当心
dāngxīn动
to take care; to look out
雨天地滑走路要当心。
Yǔ tiān dì huá zǒu lù yào dāng xīn.
The ground is slippery in the rain, so take care when walking.
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Appears across levels (7-9) in the HSK 3.0 word list.