The main work and administration of this machine is constant pressure extraction.

本机主要工作及管理是定压抽气。

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OBJECTIVE To research the optimal process of ultrahigh pressure extraction (UPE) of Saponin from Radix Astragali.

目的研究超高压提取黄芪药材中皂苷类成分的最佳工艺。

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Methods Ultrahigh pressure extraction method, ultrasonic extraction method, microwave extraction method and soxhlet extraction were used to extract flavonoids from Hawthorn.

同时，采用超高压提取法、超声波法、微波法、索氏提取法获得山楂提取液。

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Fracking is a technique of shale gas extraction that involves pumping water and chemicals into shale rock at high pressure to extract gas.

BBC: Lancashire shale gas 'could be worth billions'

In other words, the extraction process, if done improperly, could cause sudden disruptions on the ocean floor, reducing ocean pressure rates and releasing methane gas from hydrates.

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