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

So, by the same logic, that means that all of our positively charged ions are, in fact, going to be smaller in terms of radius, compared to their neutral parents.

那么，按照相同的逻辑，我们所有的正离子，事实上，它们的半径都会缩小，与它们的中性母体相比。

麻省理工公开课 - 化学原理课程节选

Let's see how these play out by means of a quick review of Beethoven's Fifth Symphony so all we're going to do here is going to go from the beginning of the track for the first movement to the second movement and so on, and well, let's just start here.

让我们通过迅速回顾贝多芬的第五交响曲,看乐章是如何表现的,我们现在要从,乐曲的第一乐章开头开始,听到第二乐章,以此类推,好,让我们从这开始

耶鲁公开课 - 聆听音乐课程节选