wet return system

例句：

1. 1.The wet back system is designed to prevent water from leaking into the building.
   湿回系统设计用来防止水渗入建筑。
2. 2. The wet back system has been proven to be effective in reducing energy consumption.
   湿回系统已被证明能有效降低能源消耗。
3. 3. The wet back system is a popular choice for businesses looking to reduce their carbon footprint.
   湿回系统是那些希望减少碳足迹的企业的一个受欢迎选择。