If I am an inertial observer, another person moving relative to me at constant velocity will also be an inertial observer.

如果我是惯性观察者,那另一个相对于我做匀速运动的人,也是一个惯性观察者

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One is inertial mass, which is how much you hate your velocity to change, how hard you resist acceleration.

一个是惯性质量,它反映了物体速度改变的难易程度,即保持加速度的难易程度

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The Earth seems to be a pretty good inertial system, because on the ground, you leave something, it stays there.

地球看上去是个不错的惯性系,因为什么东西放在地上,都会保持静止

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If you're an inertial observer, then in your system of reference, objects left at rest will remain at rest.

如果你是惯性观察者,那么在你的参考系内,静止的物体会保持静止

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But if you go to outer space nowadays, you can find truly inertial frames of reference.

但如今,要是你到了外太空,你可以找到真正的惯性参考系

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So the Earth is an inertial frame of reference, if you go in a train relative to the Earth at constant velocity, you're also inertial.

所以,地球是一个惯性参考系,如果你坐在相对于地球匀速运动的火车里,你也处于惯性状态

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But if you go on a plane which is accelerating, you're no longer inertial.

但如果你上了一架加速飞行的飞机,你就不再处于惯性状态了

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All of them mean it's really not inertial, but it's approximately inertial.

这一切都意味着它不处于惯性状态,但它很接近惯性状态

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It's a useful concept on the Earth, because Earth is approximately inertial.

这种观点在地球上很有用,因为地球很接近惯性状态

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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

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The point is that there are inertial frames of reference.

重点就是,惯性参考系是存在的

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You must know the Earth is not precisely inertial.

你们都知道,地球不是严格意义上的惯性参考系

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You have to be what's called an "inertial observer."

你必须是"惯性观察者"才行

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If you find one inertial observer, namely one person for whom this Law of Inertia works, I can manufacture for you an infinite number of other people for whom this is true.

如果你能找到一个惯性观察者,也就是适用惯性定律的人,我就可以给你找到,很多其他的也适用惯性定律的人

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