英语语法分析

How many cusps are there supposed to be on this pulmonic valve.

你认为这个肺动脉瓣有多少个瓣叶？

The most common causes are aortic or pulmonic valve regurgitation.

最常见的原因是主动脉瓣或肺动脉瓣反流。

Moderate regurgitation was detected in pulmonic, tricuspid and mitral valves.

中度返流仅见于肺动脉瓣、尖瓣和二尖瓣。