thermal expansion and contraction

例句：

1. 1.The temperature of the water has increased by5 degrees Celsius.
   水的气温已经上升了5摄氏度。
2. 2. Thermal conductivity isa measure of how well materialstransfer heat.
   热导率是衡量材料传递热量能力的一个指标。
3. 3. Thermal radiation is a form of electromagneticradiation that travels through space without beingabsorbed or reflected.
   热辐射是一种通过空间传播的电磁辐射形式，它不会吸收或反射。