"Thermodynamic" is the adjective for anything to do with the relationship between heat and other kinds of energy — heat turning into movement, movement turning into heat, energy spreading out and never quite coming back. You meet it in phrases like "thermodynamic efficiency" (how much of the heat a machine actually turns into useful work), "thermodynamic properties", and "the second law of thermodynamics".

"Thermodynamic"「thermodynamic」 is the adjective是形容詞 for anything to do with用來形容任何跟 the relationship between heat and other kinds of energy熱和其他能量之間的關係有關的東西 heat turning into movement熱變成運動 movement turning into heat運動變成熱 energy spreading out and never quite coming back能量擴散出去、再也回不來這類事。You meet it你會在 in phrases like像 "thermodynamic efficiency"「thermodynamic efficiency」（機器實際把多少熱轉成有用的功） "thermodynamic properties"「thermodynamic properties」 and和 "the second law of thermodynamics"「熱力學第二定律」 這些片語裡看到它。

The science itself is the plural noun "thermodynamics", and though it ends in -s, it takes a singular verb: "Thermodynamics is difficult", the same way "physics is" and "mathematics is".

The science itself這門科學本身 is the plural noun是複數名詞 "thermodynamics"「thermodynamics」 and而且 though it ends in -s雖然字尾是-s it takes a singular verb動詞卻用單數 : "Thermodynamics is difficult"「Thermodynamics is difficult」 the same way就跟 "physics is" and "mathematics is"「physics is」和「mathematics is」 一樣。

This is engineering and physics vocabulary — you will see it in textbooks, in articles about engines, power plants, refrigerators, and climate, and in the Chinese classroom as 熱力學. People also borrow it loosely to sound serious about limits: saying something is "thermodynamically impossible" is a heavy way of saying nature will not allow it.

This is engineering and physics vocabulary這是工程和物理的用詞 you will see it你會在 in textbooks教科書裡 in articles about engines, power plants, refrigerators, and climate介紹引擎、發電廠、冰箱、氣候的文章裡 and而且 in the Chinese classroom as 熱力學在中文課堂就叫「熱力學」 看到它。People also borrow it loosely大家也會拿它來隨便借用 to sound serious about limits讓自己講到極限的時候聽起來很有學問 : saying something is "thermodynamically impossible"說某件事「thermodynamically impossible」 is a heavy way of saying nature will not allow it是一種很重的說法，意思是大自然不允許。