In this equation, Y represents the cost of a specified unit in a production run.

在这个方程序中，Y表示在生产中生产一个单位的成本。

youdao

You can prevent this by making sure the scale (how many pixels correspond to each projected unit of distance) is the same (or close) in both the x and y directions.

您可以通过保证范围（每个投影长度单元对应多少像素）在 x 和 y 方向上相同（或接近）来防止这种情况发生。

youdao

For example, if this was the unit sphere then I would just put x, y, z.

例如，对于一个单位球面，仅用x, y, z计算就可以。

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i and j are unit vectors in the x and y directions.

和 j 分别是 x 和 y 方向上的单位矢量

耶鲁公开课 - 基础物理课程节选

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