中文定义为最小麻醉挥发剂所需肺泡浓度，在一个大气压，并达到平衡后，能使50％的测试人在外科切皮时不动。

Mac is defined as minimal alveolar concentration of an anesthetic vapour needed to prevent 50% subjects from moving toward standard surgical incision at 1 atmosphere at equilibrium.

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常用防腐剂是乙二醇或丙二醇，因为随着酒精快速挥发，捕集器也随之恢复干燥。

The preservative used is usually ethylene glycol or propylene glycol, as alcohol will evaporate quickly and the traps will dry out.

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地下水中的微量元素含量远远超过了其它地下水污染物——如硝酸盐、杀虫剂和挥发性化合物(VOCs)中的含量标准。

Trace elements in groundwater exceed human health benchmarks at a rate that far outpaces most other groundwater contaminants, such as nitrate, pesticides, and volatile organic compounds (VOCs).

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