每当测定非常低的浓度和同位素丰度时总是首先使用无机质谱法。
Spectrometry is preferably used each time extremely low concentrations and isotopic abundance are to be determined.
每当测定非常低的浓度和同位素丰度时总是首先使用无机质谱法。
Inorganic Mass Spectrometry is preferably used each time extremely low concentrations and isotopic abundance are to be determined.
靖边气田属于大面积、低丰度、低渗透气田，这种特殊的地质情况为气田的开发带来了一定的困难。
Jingbian Gasfield is a large gas field of low permeability and low abundance, encountering difficulty in its development due to special geological features.
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