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An orbit refers to a line of rolled steel for trains, trams, etc. It could also be the route of celestial bodies running through the universe. Also called a trajectory. The movement of objects means that there are certain rules, such as the movement of electrons in atoms and the operation of satellites. Action should be followed by rules, procedures, or scope: production has been on track.
On October 21, 1879, Edison's electric lighting experiment could be regarded as modern technology research
(1) temporary suspension of trains and extra units;
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