Objective: to probe into the effect of N 2O inhalation as a way of analgesic anesthesia for patients undergoing artificial abortion.

目的：探讨笑气吸入镇痛麻醉在人工流产中的疗效。

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W. Bush administrations and who surprised both ends of the political spectrum by setting aside his conservative personal views on issues such as homosexuality and abortion to keep his focus sharply medical, died Monday at his home in Hanover, N.

NPR: Koop, Who Transformed Surgeon General Post, Dies