The high pressure source mineralogy signaled by Andean adakite trace element characteristics originates in three ways.

由这种岩石的痕量元素特征揭示的高压组成矿物，表明其有三种可能的成因。

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It is possible for the feed system to have a low impedance, looking downstream from the pressure source at a certain frequency.

在压力源下游，供应系统在某一频率下可能有一低的阻抗。

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The researches of the dissertation lay down a good foundation for studying further pneumatic pressure source with high precision.

本文的工作为进一步研究高精度气体压力源打下了良好的基础。

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So far there has been no pressure from the stock market (the only pressure source Congress seems to respond to), and so no effort to act as the March 1 sequester deadline approached.

FORBES: Markets Can Handle Anything, Even A Sequester

It is even more difficult when trying to put pressure on the source of the problem.

ECONOMIST: Europe.view

Fracking involves the injection of water containing a surfactant and various other chemicals under high pressure into a source rock e.g. shale, causing the latter to fracture and release natural gas (principally methane).

FORBES: British "Fracking" Causes Earthquake -- What Now?