英语语法分析

The origin of the vertebral artery, the thyrocervical trunk and the internal mammary artery is very constant.

椎动脉，颈干和乳内动脉的起源非常恒定。

Objective: To investigate the progress of MRI diagnosis in mammary cancer.

前言：目的：探讨MRI诊断乳腺癌的研究进展。

The mammary cancer is one of the most common cancers, which threatens the females health seriously.

乳腺癌是女性最常见的一种癌症，严重地威胁着妇女的身心健康。