在相对论里面，你的观察总是必须会涉及到一个特定的观察者-一个相对于被观察物有着明确的相对运动的观察者。
In relativity, your observations must always be with respect to a particular observer-an observer with a well-defined motion relative to whatever is being observed.
在广义相对论里面，物理学家把重力当做是时空中的一种扭曲，从而详尽的解释了黑洞的细节。
Using general relativity, which treats gravity as a distortion of space-time, physicists were able to describe black holes in gory detail.
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