The mechanism of sand pressure-blasting machine whether in physical properties or chemical performance is superior to the natural sand.

制砂机的机制砂无论在物理性能还是化学性能上都优于天然砂。

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The main loads such as the water pressure, the sand pressure, the uplift pressure and so on are carried on by both the gravity wall and the rockfill body.

库水压力、淤沙压力和扬压力等主要荷载由重力墙与堆石体共同承担，重力墙与堆石体互相支撑，维持稳定。

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Sand might seem more natural than pollution, but it is an indication of long-term pressure on the environment.

沙尘较之污染，也许让人觉得比较属于自然现象，但是它也反映了环境长期以来所受到的压力。

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They drill down to the shale, then go sideways and inject high-pressure water, sand or other material into the rock.

VOA: special.2009.10.23

This year he completed what is believed to be the first ever fracture stimulation procedure in Turkey: injecting a mixture of water and sand at high pressure down the wells to break up rock and release gas.

FORBES: Magazine Article

About 25, 000 wells a year are being fracked, a process in which water, chemicals and sand are injected at high pressure underground to release trapped natural gas.

NPR: Report: Flaws In EPA Drilling Pollution Data

As the drill progresses through the rock and sand below the seabed, the pressure of the mud in the drill string must be kept within a limited range.

ECONOMIST: Inside story