当油进行商业加工的时候，首先要做的是在其中加入化学溶剂并把它加热到很高的温度，然后经过五六道程序的加工。

When an oil is commercially processed, the first thing they do is add solvents and raise them to really high temperatures, then put it though five or six processes.

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这个标准描述了采用溶剂粘结方法进行PVC管道和连接件连接的程序。

This standard describes the procedure for making joints with PVC pipe and fittings by means of solvent cementing.

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因此，在早期的确认程序中，保证取样媒介和溶剂(用于从媒介中萃取)的满意度和它们可以被使用是很重要的。

Therefore, early in the validation program, it is important to assure that the sampling medium and solvent (used for extraction from the medium) are satisfactory and can be readily used.

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