一般在参考点之前为负，参考点之后为正，那么这和我们讲的有什么关系呢？

Typically it's negative what you are before the reference point, and positive afterwards. So, now, how does it relate to the things we've seen there?

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借助于分离参考点的位置坐标，通过改变叶片形状系数，能有效地使分离参考点移向叶片出口端。

Having the aid of position coordinate of reference separation point, the point can be moved to outlet of vane by changing coefficient of vane shape.

youdao

对机床回参考点进行了研究，分析了各种机床回参考点形式，并介绍实现高精度回参考点的方法。

The machine tool's return reference point is studied, various machine tool's return reference point forms are analyzed and the method for achieving high precision return reference point is presented.

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So this unique temperature and unique pressure defines a triple point everywhere, and that's a great reference point.

这样，无论在何处,三相点都具有相同的温度和压强,十分适合来作参考点。

麻省理工公开课 - 热力学与动力学课程节选

How to go from one reference point to the other with this property. This property, f which we're going to call f.

这两个参考点插值,得到不同温度时工作物质的特性，我们把这一特性记做。

麻省理工公开课 - 热力学与动力学课程节选

So, you need some reference points to be able to tell you, OK, this temperature is 550 degrees Smith, whatever.

你需要定要一些参考点,它们告诉你，“这个温度是550史密斯氏度“之类。

麻省理工公开课 - 热力学与动力学课程节选