HSK 7-9
保鲜
bǎoxiān动
to keep fresh; to preserve freshness
蔬菜装进袋子更容易保鲜。
Shū cài zhuāng jìn dài zi gèng róng yì bǎo xiān.
Vegetables stay fresh more easily when placed in a bag.
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Appears across levels (7-9) in the HSK 3.0 word list.