保暖 bǎonuǎn HSK7 to keep warm Origin Definitions Defs Strokes Stroke Words Sentences Sents 保暖内衣 bǎonuǎnnèiyī thermal underwear thermal underwear; long underwear保暖杯 bǎonuǎnbēi vacuum flask A cup or flask used to keep its contents warm or cold for an extended period; synonym for [[保温杯|保溫杯|bao3 wen1 bei1]].