"So I think in context, that's a positive sign."

VOA: standard.2010.07.02

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

Paul Salem,who heads the Carnegie Center for Peace in the Middle East,argues that, despite the current impasse, it is a positive sign that Iraqi political adversaries are discussing their differences in parliament.

VOA: standard.2009.10.26

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

"We're looking for concrete steps. And we take it as a positive sign that they've agreed in principle to take a couple of significant steps the opening of the Qom facility, and then working out a procedure for having their low-enriched uranium re-processed in another country.

VOA: standard.2009.10.24