heat motion

例句：

1. 1. The heat motion of the sun causes the Earth's surface to warm up.
   太阳的热运动导致地球表面变暖。
2. 2. Heat motion is a fundamental principle in thermodynamics.
   热运动是热力学的一个基本原理。
3. 3. The scientist observed the heat motion of the gas molecules during the experiment.
   科学家在实验中观察了气体分子的热运动。