drainage of subphrenic abscess

例句：

1. 1.The drainage of the lake is very important for maintaining water quality.
   湖泊的排水对于保持水质非常重要。
2. 2. The city has a comprehensive drainage system to prevent flooding during heavy rains.
   这个城市有一个全面的排水系统，以防止大雨期间发生洪水。
3. 3. The drainage of sewage is crucial for environmental protection.
   污水排放对于环境保护至关重要。