英语语法分析

The tail consists of 4 segments: neck region, midpiece, principle piece and endpiece.

尾部又分4段：颈段、中段、主段和末段。

The midpiece consists of 5 or 6 mitochondria, a pair of centriole and several vesicles.

中段包括5或6个线粒体，一对中心粒及一些泡状结构。

Objective To approach the clinical method of complex therapy for midpiece esophagus cancer.

目的探讨综合治疗中段食管癌的临床方法。