What is the micanical

Mechanical engineers design power-producing machines, such as electric generators, internal combustion engines, and steam and gas turbines, as well as power-using machines, such as refrigeration and air-conditioning systems. Mechanical engineers design other machines inside buildings, such as elevators and escalators.

Mechanical refers to the expertise or use of machinery or tools.

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explanation:

it refers to the definition of full-contact sports, where the condition is that the sport must have athletes must "purposely collide with each other