K So minus minus K is plus K.

负负得正得到。

麻省理工公开课 - 固态化学导论课程节选

Wrev So minus w reversible, 1 p2 is less than p1, so p2 over p1 is less than one, log of something less than 1 is negative times negative.

那么，而p2小于p1，p2/p1小于，取对数后是负数,负负得正。

麻省理工公开课 - 热力学与动力学课程节选

If when x is low, y also tends to be low, then this will be negative number and so will this, so their product is positive.

如果x取值小,同时y值也小,这将是一个负值,这个也是负值,负负得正,结果是正值

耶鲁公开课 - 金融市场课程节选