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Chapter 418 Time of the river
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... Just know that it is relative to the up, down, left, and right and left distances of another negligible size of the static reference. A few miles of geometry is enough.
Describe the instantaneous position of a moving object is not enough, you need to know the instantaneous speed and acceleration. Thus, the concept of a three-dimensional space coordinate system and one-dimensional time coordinates can be abstracted. The nature and laws of the motion of objects are closely related to the m ...
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