What's more, current rate of spin is not a terribly good measure without knowing the original spin rate too.

另外，在不知道初始自传速度的情况下，目前的自传速度并不是一个非常要的测算方法。

youdao

But if spin can be proved a universal aspect of black holes, then the rate of spin can be used to infer something very important about a black hole's history.

但是如果旋转可以被证实是黑洞的一个通常的面目，那么，旋转速度就可以用来推断一个黑洞历史上一些重要的事。

youdao

And so we can use the spin rate, the rotation rate of a star, as a clock to measure its age.

因此，我们可以用星星的自转速度及速率作为衡量它们年龄的计时器。

youdao

Astronomers have measured the rate of spin of a supermassive black hole for the first time - and it is big.

BBC: First glimpse of a black hole's spin

The biggest moment of drama came when the Austrian went into a spin as he hurtled towards the ground, turning at a maximum rate of 60 revolutions per minute.

BBC: Skydiver Felix Baumgartner fell faster than first thought