In this paper, various correlative GPS space reference frames in GPS measurement field and the principle of GPS signal constitution are introduced first.

本文首先介绍了GPS测量应用中的各种时空坐标系统，以及GPS信号构成等基本知识。

youdao

But if you go to outer space nowadays, you can find truly inertial frames of reference.

但如今,要是你到了外太空,你可以找到真正的惯性参考系

耶鲁公开课 - 基础物理课程节选

And sell it did, so much so that it moved the titans of tech to innovate the space, with Google enlisting ASUS' engineering for its popular and affordable Nexus 7 reference tab (named for its relatively diminutive size) and even Apple, which once infamously disavowed the smaller format altogether, releasing the 7.9-inch iPad mini.

ENGADGET: 's CES 2013 Preview: Tablets

In reference to each body on each moment in Time there are always only two coordinates in Space for one perpendicular.

FORBES: Colliding Galaxies Provide A Glimpse Into Our Future