英语语法分析

Methods During the operation, the cranial flap were kept floating on the pachymeninx of bone window repaired carefully.

方法术中硬脑膜减张严密修复，让骨瓣漂浮于骨窗硬脑膜上。

The operation mode needs operate with two hands, having the disadvantages of easy brain tissue losing, the irregular cutting edge of the pachymeninx and long time needed.

这种手术方式需双手操作，容易损失脑组织，硬脑膜切缘不整齐，需用时间长。