在冷库中，冷冻食品在经过长时间保存后，依然可以食用。但是，一旦解冻，食品很快就腐烂了。

Frozen food remains edible for a very long time in the freezer, but once thawed, it spoils quickly.

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我们冷冻鱼以便它能长时间保鲜。

We freeze the fish so that it will be fresh for a long time.

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研究人员不知道他们的青蛙细胞能存活多长时间，所以他们决定马上冷冻他们。

The researchers had no idea how long their frog cells would last and so decided to freeze them at once.

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