干柴好烧。

Wood burns better [more easily] when dry.

《新英汉大辞典》

老柴好烧，老书宜读。

Old wood is best to burn, old book to read.

youdao

老柴好烧，老马好骑。

Old wood is best to burn, old horse to ride.

youdao

But, you know, his experiment wasn't so great, and, you know, maybe had a fever when he did the reference point with 96, whatever. It turns out that it's not 96 to 9 be in good health, it's 98.6 -- whatever.

但是他的实验做得并不特别好，也许他测定96度的参考点时,发了烧还是怎么，总之健康人的体温,不是96度，而是。

麻省理工公开课 - 热力学与动力学课程节选