And you can think about that if you think about a standing wave, for example, where you can have amplitude at many different values of x, so an amplitude at many different distances, but you also have areas where there is a amplitude.
你们可以想象一下驻波,在不同x处,可以有不同的振幅,在不同的距离有不同的振幅,但在某些地方振幅等于0.
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。
You can either think of it as an arrow and imagine the arrow, or you can reduce it to a pair of numbers, x and y.
你既可以用有向线段来表示,也可以用一组数字来表示,x 和 y
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