The Free Soil leaders proposed a convention of all who supported their ideas.

VOA: special.2009.03.12

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

The Convention on the Elimination of All Forms of 9 Discrimination Against Women of 1979 has article 16 which talks quite a lot about rights of women in the family and marriage.

消除对妇女一切形式歧视公约》,于1979年通过9,第16条是关于,妇女在家庭和婚姻里的权利的。

普林斯顿公开课 - 人性课程节选

Deputy Executive Director of the U.N.Children's Fund, Saad Houry, agrees that the reality does not always live up to the Convention's vision of a world that is made safe for all children.

VOA: standard.2009.10.08

Convention, OK, this negative sign is just a pure convention. You just got to use it all the time. If you use an old textbook, written when I was taking thermodynamics, they have the opposite convention, and it's very confusing. But now we've all agreed on this convention, and work is going to be with the negative sign here.

系统对外界做功的符号为负,这就是我们,在本课中的规定，纯粹出于统一符号的需要，有些教科书中，可能会使用相反的符号规定,注意不要混淆了，这门课上,我们将一直使用。

麻省理工公开课 - 热力学与动力学课程节选