人工清砂费用低，有些局部处理的不是很干净。

Artificial rust-removing expenses low, some local processing is not very clean.

youdao

而抛丸清砂则相反，费用高，检验平板表面清理的非常干净。

And is shot rust-removing, by contrast, cost is high, inspection of the surface cleaning plate are very clean.

youdao

而抛丸清砂则相反，费用高，检验平板表面清理的非常干净。

And is shot rust-removing, by contrast, cost is high, inspection of the surface cleaning plate are very clean.

youdao