英语语法分析

Sternal pressure may be painful if the sternum is fractured or costochondral separations exist.

胸骨骨折和肋骨骨折在加压下会有疼痛。

Methods: The costochondral lengths were measured on 29 children bodies and the histological characteristics of costochondral joints were observed by light microscopy.

方法 ：对 2 9具儿童尸体标本进行肋软骨测量 ，光镜下观察肋软骨连结组织学特点 ，并对肋软骨折断后进行断端组织学观察。