This article, on the basis of four dimensional coordinates and four dimensional wave vectors of world space, proves the phrase constancy of electromagnetic waves.
作者在该文中从世界空间的四维坐标和四维波矢量出发，证明了电磁波的相位不变性。
The space measurement and control stations are distributed in the different plates all over the world, and the site coordinates must be changed according to crust deformation.
航天测控站分布在全球不同的板块，其站址坐标随地壳形变而发生变化。
Note that because the origin of the world coordinate space is at the upper-left corner of the client area, the page coordinates are the same as the world coordinates.
请注意，由于全局座标空间的原点位于工作区的左上角，因此画面座标和全局座标是相同的。
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