经过这样的分析会发现，牛顿定律在以遥远星系为不动的参考系中有效。

Once this analysis is done, it is clear that (for non-relativistic speeds, at least!) Newton's laws work in a frame in which the distant galaxies do not rotate.

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牛顿力学：牛顿第一、二、三定律，惯性和非惯性参考系，牛顿守恒定律，力和潜能，重力场，向心力，低频振荡。

Newtonian dynamics: first, second and third laws, inertial and non-inertial reference frames, conservation laws, forces and potentials, gravitational field, central forces, small oscillations.

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本文以太阳系质心参考系为基础推导了VLBI时延和引力延迟的后牛顿表达式；

The relativistic geometric time delay of VLBI is derived in the Barycentric Reference System (BRS).

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