英语语法分析

Objective:To discuss the risk factors in gangrenous cholecystitis(GC).

目的：探讨坏疽性胆囊炎（GC）发生的危险因素。

The boy's left arm had been ripped off and was badly infected and gangrenous.

这个小男孩的左胳膊已经被扯掉了，而且已经严重的感染并已经腐烂。

Then her hips and knees seized up; some of her toes became gangrenous and had to be amputated.

接着，她的大腿和膝盖失灵；她的一些脚趾坏疽，不得不切除。