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.
采伐对森林湿地氧化亚氮排放的季节变化规律影响较大，没有一定的规律性，是温度和水位共同作用的结果。
Cutting had quite large influence on seasonal changing regulation of N2O emission without certain regulations, which was considered the result of actions combined temperature and water level.
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