英语语法分析

The SD of tricuspid annuli began to increase 3 month after operation (P<0.05).

术后3月三尖瓣环下移距离有所增大（P<0.05）；

The SD of mitral and tricuspid annuli were more lower than control group (P<0.01), and E velocity of mitral flow is higher (P<0.01) .

患者较正常对照组心脏二尖瓣环、三尖瓣环下移距离显著减小（P<0.01），二尖瓣E波最大流速显著增大（P<0.01）；

An experimental study on forced convection heat transfer of single-phase water in vertical and horizontal narrow annuli was performed.

对竖直及水平窄缝环形流道内单相水受迫对流换热进行了实验研究。