heat emissivity

例句：

1. 1. The solar panel's efficiency is directly related to its heat emissivity.
   太阳能电池的效率与其热辐射率直接相关。
2. 2.The study found that the heat emissivity of the material could be adjusted by adding certain additives.
   研究发现，通过添加某些添加剂，材料的热辐射率可以调整。
3. 3.The engineer used a special sensor to measure the heat emissivity of the surface.
   工程师使用一种特殊的传感器来测量表面的温度辐射率。