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Well you know what a point is, it's got an x- and a y- coordinate, it's natural to think about those two things as belonging as a single entity.
把这两个坐标认为，是属于一个独立的实体，是理所当然的事情,因此实现这个目的的。
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So, there is a way to go from the unprimed coordinates to the prime coordinate by rotating your axis and actually calculating the components.
现在我们有一种方法可以从原坐标系,转变到新坐标系,只要旋转坐标轴,并实际地计算一下坐标即可
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It's easy to think of a point as just a list of an x- and a y- coordinate.
或者说有两个元素的数组,把一个点认为是含有x坐标。
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The equation for the y coordinate is the height of the building.
坐标的方程是楼的高度
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So x is not really the coordinate of the end point.
其实并不是弹簧端点的坐标
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How about the y coordinate?
坐标呢
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How do the components of A in the new rotated coordinate system relate to the components of the old coordinate system?
在旋转后的新坐标系中 A 的分量,和原始坐标系中 A 的分量有什么关联呢
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The x coordinate of the car is the 0, because this is my origin.
车的 x 坐标为0,因为这就是原点
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At that time t, the x coordinate must have a certain value.
在该时刻,x 坐标一定是个确定的值
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