HSK 6
保暖
bǎonuǎn动
to keep warm
雪天出门一定注意保暖。
Xuě tiān chū mén yí dìng zhù yì bǎo nuǎn.
Be sure to keep warm when going out on snowy days.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.