我们计算的是，整个区域的面积微元dA的总和。
Really, what we are doing is summing dA over the entire region.
另外，薄膜硅技术也被开发出来，将非晶硅或者微晶硅薄膜放到玻璃那样的平的大面积衬底上。
Besides, thin-film silicon technologies have also been developed to place a thin film of amorphous or microcrystalline silicon onto flat large-area substrates such as glass.
活性碳微球作为一种新型的碳材料，由于具有较高的比表面积和优良的吸附性能而广泛应用在气体的储存和净化上。
The activated mesocarbon microbeads(a-MCMBs) as one kind of new carbon material is widely used in the gas storage and purification for the high BET specific surface area and good .
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