thermal electrical relay

例句：

1. 1. The hot air rises and cools down the surrounding area.
   热空气上升并使周围区域变凉。
2. 2.The thermal conductivity of the material is important for its use in heat exchangers.
   材料的热导率对其在换热器中的使用很重要。
3. 3.Thermal radiation is a form of electromagnetic radiation that travels through space without any medium.
   热辐射是一种通过空间传播的电磁辐射形式，没有介质。