electric tube expander

例句：

1. 1. This device is used to expand the diameter of a pipe by applying electricity.
   这个装置通过施加电力来扩大管道的直径。
2. 2. The electric tube expander was designed to improve the efficiency of the heating system.
   电管扩张器被设计用来提高加热系统的效率。
3. 3. In this experiment, we used an electric tube expander to test the effectiveness of our new material.
   在这个实验中，我们使用了一个电管扩张器来测试我们新材料的效果。