Prime Minister Manmohan Singh pledged Sunday that his government will work for a positive outcome at next month's crucial United Nations summit on setting targets for carbon emissions.

VOA: standard.2009.11.08

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

And we work on the positive on what comes of this side of the graph that you saw up there.

我们研究积极性，它处于这一边,大家可以在这上面看到。

哈佛公开课 - 幸福课课程节选

This work of pluralism, this work of engagement, this work of a positive interchange between religious communities. -Right.

这项工作就是发展多元主义，融合，积极地展开,宗教团体间的交流，-对。

普林斯顿公开课 - 人性课程节选

Delta v is positive in this direction here, the work is negative. So work on the system is positive. Work done by the system is negative.

功是负的，总而言之,外界对系统做功的符号为正。

麻省理工公开课 - 热力学与动力学课程节选

So if delta v is negative, in this case delta v is negative, OK, delta v is negative, pressure is a positive number, negative times negative is positive, work is greater than zero.

也就是当活塞,压缩气体的时候，做的功是正的，按照这一规定,我们需要在这里，加上一个负号，这是习惯规定。

麻省理工公开课 - 热力学与动力学课程节选