这就表示溶液上的，蒸汽压下降，所以这就是刚才说的饱和蒸汽压下降。
So, that means that the vapor pressure above the solution is lowered. So I should have said vapor pressure lowering.
用饱和蒸汽加热的，须增加鼓壁的厚度和重量。
Heated with saturated steam, to increase the drum wall thickness and weight.
由于残余水分受到某种引力的束缚，其饱和蒸汽压则是不同程度的降低，因而干燥速度明显下降。
Due to residual moisture by a gravitational bound, the saturated vapor pressure is reduced in different degree, thus drying rate dropped significantly.
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