self-operating fountains

例句：

1. 1. The self-operating system allows for easy maintenanceand upgrades.
   这个自运行系统便于维护和升级。
2. 2. The self-operatingmachine can perform complex tasks without human intervention.
   这种自运行机器可以在没有人为干预的情况下执行复杂的任务。
3. 3. The self-operating device is designed to save energy andreduce waste.
   这种自运行装置旨在节省能源并减少浪费。