When we do relativity, we'll be dealing with vectors in space-time and we'll find that different observers disagree on what is this and what is that.

我们学习相对论的时侯,会涉及到时空矢量的问题,我们会发现观测者们对于观测的结果,有着不同的看法

耶鲁公开课 - 基础物理课程节选

it's not that there's only one fortunate family of inertial observers.

并不是说只存在一种惯性观察者

耶鲁公开课 - 基础物理课程节选