英语语法分析

The objective is to explore the roles of color Doppler vena contracta in the evaluation of mitral regurgitation grading.

目的是探讨彩色多普勒静脉收缩术在评估二尖瓣反流分级中的作用。

Mild mitral regurgitation.

二尖瓣轻度反流。

Traditional teaching advocates regurgitation whereas progressive education encourages critical thinking.

传统教学主张照本宣科；开明教育鼓励批判思考。