If you were in a 3D space and could only see a plane (an infinite, 2D flat surface that has x/y axes for the sake of simplicity) at a time, then moving across the z axis would allow you to see different slices of a 3D space, but you would still only see a 2D slice in any given moment.
Time is the similar: in any given moment, you can only see and interact with a 3D space, but as you go forward/backward in time, you get to see different 3D spaces.
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