You may daily take an elevator up and down frequently, so you must be familiar with an elevator.
In fact, are you really familiar with an elevator?
Have you ever thought of what on earth an elevator is?
An elevator (lift in British English) is a type of vertical transport equipment that efficiently moves people or goods between floors (levels, decks) of a building, vessel, or other structure. Elevators are generally powered by electric motors that either drive traction cables or counterweight systems like a hoist, or pump hydraulic fluid to raise a cylindrical piston like a jack.(excerpt from Wikipedia)
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