This is called a "right-handed" coordinate system because the thumb and first two fingers of your right hand can be used to represent the three directions.
这被称为“右手”坐标系统，因为你右手的大拇指、食指和中指可以被用来表示三个方向。
Of course the letters represent the three directions - in this case - north, south and west.
当然这三个字母在这种情况下代表三个方向北、南和西。
This rooftop landscape guides and underscores the movements of the roof, which extends in three directions.
这屋顶景观引导和强调了屋顶的动感：它在三个方向延伸。
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