heat density

例句：

1. 1. The heat density of the material is crucial for its performance.
   该材料的热密度对其性能至关重要。
2. 2.In order to improve energy efficiency, engineers need to optimize the heat density of their designs.
   为了提高能源效率，工程师需要优化他们的设计中的热密度。
3. 3. Heat density is a measure of how much energy is stored in a given volume of matter.
   热密度是衡量给定体积的物质中存储能量的量。