genesic

1.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理。

2.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.

本文从水文质环境着手，区矿泉水的成因类型、找矿方向及其开发利用途径。