一旦冷冻，把材料放在冷冻干燥器里四天，除去水分。
Once frozen, the material was placed in a freeze-dryer that removed all the water from it over the course of four days.
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.
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 Avery long time in the freezer, but once thawed, it spoils quickly.
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