渠道断面填挖面积计算是渠道设计中的填挖土方量计算的基础工作。
The calculation about the area of filling-in and excavation of canal cross section is the basic work in earth volume of the canal designing.
我建议把那些洞填回去，再挖新的。
人们向坑里填进未分类的垃圾，然后再挖更多的坑，所以垃圾就不见了。
They filled the pits with unsorted garbage, then dug more pits and so it has gone.
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