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.
一旦除去亚硫酸钠和四硫硫酸钠，冷冻干燥后，A链单体大部分转变成二体。
After the removal of the sulfite and tetrathionate by dialysis and lyophilization, the A-chain monomer was transformed gradually into the dimer.
一旦除去亚硫酸钠和四硫硫酸钠，冷冻干燥后，A链单体大部分转变成二体。
After the removal of the sulfite and tetrathionate by dialysis and lyophilization, the A-chain monomer was transformed gradually into the dimer.
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