换土垫层厚度设计是换填法地基处理设计的关键。
The design of replacement underlayer thickness is crucial to the replacement method of ground treatment.
注意吸尘器的土袋是否已满，当土袋装满时，要及时更换土袋。
Change vacuum dust bags when they are full taking care that they are full.
注意吸尘器的土袋是否已满，当土袋装满时，要及时更换土袋。
Change vacuum dust bags when they are full taking care that they are full.
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