The point of Newton is, two things in the Law of Inertia, which one may think is trivial.

牛顿的观点是,惯性定律分两部分,可能有人觉得这种分法无关紧要

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If I give you one observer for whom the Law of Inertia is true, I say that others for whom is also true.

如果知道一个人适用惯性定律,那肯定有其他一部分人也适用惯性定律

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if the Law of Inertia is valid for me, it's valid for other people in the same room at rest with respect to me.

如果惯性定律对我适用,那就对这屋子里的其他和我保持相对静止的人,也同样适用

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That is an example of a person for whom the Law of Inertia does not work.

这就是一个惯性定律不成立的例子

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It's called the Law of Inertia.

又名惯性定律

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The Law of Inertia says that, "If a body has no forces acting on it, then it will remain at rest if it was at rest to begin with, or if it had a velocity to begin with, it will maintain that velocity."

惯性定律就是,"如果一个物体不受外力作用,那么静止的物体依然保持静止,如果物体有个初速度,那么就保持此速度不变"

耶鲁公开课 - 基础物理课程节选