steam heat-supply network

例句：

1. 1. The steam from the kettle has warmed my hands.
   水壶里的蒸汽让我的手暖和了。
2. 2. Steam is a common phenomenon in many natural environments.
   蒸汽是许多自然环境中常见的现象。
3. 3. The steam engine was invented to power ships and locomotives.
   蒸汽机被发明出来用于推动船只和机车。