HSK 7-9
冷冻
lěngdòng动
to freeze (food etc); (of weather) freezing
新鲜鱼应尽快冷冻保存。
Xīnxiān yú yīng jǐnkuài lěngdòng bǎocún.
Fresh fish should be frozen and stored as soon as possible.
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Appears across levels (7-9) in the HSK 3.0 word list.