形成黑洞的关键环节，就是要像脉冲星崩溃时出现的情况一样，把足够大的质量或能量压缩到足够小的体积。

The key to forming a black hole is cramming enough mass or energy into a small enough volume as happens when a massive star collapses.

youdao

正因为了有这条定律，我们才能得知例如金星这样离日相对较近的行星的公转周期要短于离日较远的行星，例如海王星。

Thanks to this law, we know that a planet relatively close to the sun, like Venus, has a far briefer orbital period than a distant planet, such as Neptune.

youdao

它也将设定利率，可能要通货膨胀目标这样的北极星来指引利率。

It would also have to set interest rates, and would need a lodestar, probably an inflation target, to guide it.

youdao

So that's the reason I am taking Eurostar.

所以，这就是我为什么要坐欧洲之星的原因。

方便的欧洲之星 - SpeakingMax英语口语达人