单词：cannulas
套管, 插管
n a small flexible tube inserted into a body cavity for draining off fluid or introducing medication
cannulas的用法和样例：
例句
- The entire procedure may be completed through the cannulas or by lengthening one of the small cannula incisions.全部手术可以完全利用套管进行或者需要扩大其中一个套管的切口。