HSK 4
千万
qiānwàn副
ten million; countless; many; one must by all means
下雨天开车千万要小心。
Xià yǔ tiān kāi chē qiān wàn yào xiǎo xīn.
Be especially careful when driving in the rain.
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New in the HSK 3.0 word list at level 4.