英语语法分析

Pneumomediastinum may cause caval obstruction.

纵隔积气可能引起腔静脉梗阻。

The use of a high-speed dental drill may introduce air into the soft tissue and lead to subcutaneous emphysema and pneumomediastinum.

拔牙时所使用的高速牙科电钻可能使得气体进入软组织，进而导致皮下气肿及纵膈气肿。