Silvia expects the situation to improve soon. "I would suspect that the jobs numbers would turn positive by the second quarter of this year, so probably another two or three months out we'll get some positive jobs numbers."

VOA: standard.2010.03.02

This is called the geometric average and it's used only for positive numbers.

这种平均叫几何平均,只能用于正的数值

耶鲁公开课 - 金融市场课程节选

Or if you want negative numbers, between negative 2 billion and positive 2 billion, but it's a finite range.

或者你想储存一个负数，就必须位于负20亿到,正20亿之间，是个有限的范围。

哈佛公开课 - 计算机科学课程节选