fine pumping
好抽
以上为机器翻译结果，长、整句建议使用 人工翻译 。
However, in the conventional vacuum pumping tests, fine particles did not lost and there was clogging without arching structure layer.
而常规真空抽水方法中不存在细颗粒流失，没有形成拱架结构，造成了淤堵。
youdao
Specially formulated lubricants are used in fracking, which involves pumping water, fine sand and fracking fluids underground to split open oil- and gas-bearing rocks.
NPR: Judge Sides With Wyoming In Fracking Chemical Suit
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