Some are improving office air systems or are moving desks farther apart.

一些公司正在改善办公室的空气系统，或者将办公桌隔得更远。

It starts at zero and eventually the galaxies are moving apart at a steady speed.

它从零开始，最终星系以稳定的速度分开。

If things are moving apart, it stands to reason that they were once closer together.

如果事情正在分开，那么它们曾经靠得更近是理所当然的。

Similarly, in Friedmann's model the speed at which any two galaxies are moving apart is proportional to the distance between them.

同样，在弗里德曼的模型中，任何两个星系移动的速度都与它们之间的距离成正比。