During the process, a film of varying thickness covers the surface of the metal.
在此过程中，一变化着厚度的膜覆盖在金属表面上。
The material thickness is the key factor that influences the freeze-drying process.
物料厚度是影响冻干过程的关键因素；
The material thickness is the key factor that influences the freeze-drying process.
物料厚度是影响冻干过程的关键因素；
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