hot tube expanding machine

例句：

1. 1.This hot tube expanding machine is used to expand the pipes in a heating system.
   这种热水管扩张机用于加热系统中的管道膨胀。
2. 2.The hot tube expanding machine was developed to improve the efficiency of the heating system.
   热水管扩张机的开发旨在提高加热系统的效率。
3. 3.The hot tube expanding machine is an essential tool for maintaining the proper temperature in a building.
   热水管扩张机是维护建筑物适当温度的关键工具。