英语语法分析

The key to preventing from bleeding of anterior sacral vein is posterior rectal wall is that dissociated between the proper fascia of rectum and anterior sacral fascia in rectectomy.

在直肠切除术中，沿直肠固有筋膜及骶前筋膜之间游离直肠后壁是预防骶前出血的关键。