HSK 6
再三
zàisān副
over and over again; again and again
父亲再三提醒我保管好证件。
Fù qīn zài sān tí xǐng wǒ bǎo guǎn hǎo zhèng jiàn.
My father repeatedly reminded me to keep my documents safe.
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New in the HSK 3.0 word list at level 6.