Here is one example, "It Might as Well Be Spring."

VOA: special.2010.03.15

If we think about the drinks industry more generally here, rather than just beer, this would be Guinness, this would be Poland Spring, This is water and everything else would be in between here.

如果我们把啤酒业想得更普遍点,不仅仅只有啤酒,这可能是吉尼斯,这可能是波兰泉水,这是水而其他的产品分布在中间

耶鲁公开课 - 博弈论课程节选

So the spring is being pushed by mg here and mg here.

所以弹簧受到一个向下的 mg 还有一个向上的 mg

耶鲁公开课 - 基础物理课程节选