genesic

Objective To discuss genesic mechanism of trachea arteria anonyma fistula after tracheotomy.

目的探讨气管切开术后并发气管无名动脉瘘的发生机。

From the viewpoint of the hydrogeological environment,this paperdescribes the genesic types,prospecting direction and its way of deve-lopment of the spring in Jianregion.

从水地质环境着手，论述吉安地区泉水的成因类、方向及其开发利用途径。