Double-tube drainage的用法和样例：
例句
- Catheter drainage of the bladder relieves trigonal stretch and improves drainage from the upper tract.
膀胱置管引流减少三角区牵张，并改善上尿路引流。 - Methods use root tube drainage or toot tube treating after opening a window in apical labium,conservative treatment on apical cyst,use the root tube filling agent suitable filling.
方法采用根管引流或根尖部唇侧开窗引流后根管充填剂适当超填方法保守治疗根尖囊肿。
