freeze dehydration

例句：

1. 1. Freeze-dried food is a popular choice for emergency supplies.
   冻干食品是紧急物资的热门选择。
2. 2.The process of freeze-drying involves removing water from the material to preserve it.
   冻干过程涉及从材料中去除水分以保持其原样。
3. 3.In this method, the food is first frozen and then dried in a vacuum.
   在这个方法中，食物首先被冷冻，然后在真空中干燥。