即使对于通常都包含十几个特定认知能力测试子项的IQ而言，所得到的分数也不可避免地含有一些可反映更细微差别的能力“杂质”。
Even the scores from IQ tests--which usually combine about a dozen subtests of specific cognitive skills--contain some "impurities" that reflect those narrower skills.
但是SF_6电气设备中的气体不可避免的含有杂质，在电弧作用下，这些杂质容易与SF_6气体的分解物反应生成毒性物质，从而腐蚀电气设备，降低设备绝缘能力。
Under the arc action, the impurity can easily react with the decomposed product of SF_6, and then produce poison which can corrupt electric equipment, degrade its insulation performance.
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