氧化亚氮(N2O)是一种对大气环境有很大破坏作用的污染气体，煤的流化床燃烧是其重要来源。

Nitrous oxide (N2O) is a pollutant gas which has very strong destruction influence on atmosphere environment. Coal combustion in fluidized beds is an important resource for N2O.

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氧化亚氮(N2O)是大气中的一种痕量气体，也是一种重要的温室效应气体，还可使臭氧层遭到破坏。

Nitrous oxide (N2O) is a trace gas in the atmosphere, which contributes both to the greenhouse effect and to the destruction of stratospheric ozone.

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目的：探讨氧化亚氮（N_2O）吸入麻醉下行无痛人工流产的有效性与安全性。

Objective: To investigate the analgesic effect and the safety of N2O inhaled in induced abortion.

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