dS/dV And that, now, we know must equal dS/dV, with a positive sign. At constant temperature.

我们知道这个等于恒定温度下的，符号为正。

麻省理工公开课 - 热力学与动力学课程节选

So this is not a very positive sign and people are having a bad relationship with food.

这不是个正面的信号,人们和食物之间的关系变糟

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.

历史上有过不同的习惯，这里我们规定,如果环境对系统做功。

麻省理工公开课 - 热力学与动力学课程节选