For the exist of moisture content gradient and thermal gradient, the thickness swelling is larger than the line swelling and so the thickness swelling is the emphasis of study.
由于含水率梯度和温度梯度的存在,使得厚度膨胀远远高于线膨胀,因此厚度膨胀历来是尺寸稳定性的研究重点。
The reason is that it is under the effect of matrix potential gradient in stead of moisture content gradient.
其原因是土壤水运动是在相应的基质势梯度作用下发生的,而并不需要对应的含水量梯度。
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