说明：  热学是研究与热现象有关的规律的科学。 热现象是物质中大量分子无规则运动的集体表现。 大量分子的无规则运动称为热运动。
(Thermal and thermal phenomena is the study of the laws of science. Phenomenon is the large number of hot material in the random motion of molecules collective performance. A large number of random motion of molecules called thermal motion.)