英语语法分析

The oxygen radicals theory should be the etiology of presbyacusis.

氧自由基学说应该是老年性聋的发病病因。

The purpose of this study was to investigate the etiology, clinic featuer, and therapy of recurrent nodular nonsuppurative.

该研究的目的是研究复发性结节性非化脓性脂膜炎的病因、临床表现以及治疗方法。

Analyze the etiology, therapeutic methods and curative effect of postoperative gastroplegia syndrome (PGS) after radical colectomy and proctectomy.

分析结直肠癌术后胃瘫综合征（PGS）发生的病因、治疗方法和疗效。