英语语法分析

Tracheobronchial tumors are very rare and account for only< 0.4% of all body tumors.

气管肿瘤是非常少见的，不到全身肿瘤的0.4％。

Objective To report the experience of surgical treatment of tuberculous tracheobronchial stenosis.

目的报告结核性气管、支气管狭窄的外科治疗经验。

Abstract: objective to report the experience of surgical treatment of tuberculous tracheobronchial stenosis.

文摘：目的报告结核性气管、支气管狭窄的外科治疗经验。