cars run using 4-stroke petrol engine, a type of
internal combustion engine 内燃机 nèi rán jī.
The combustion requires fuel (petrol), oxygen
ignition temperature (created by the spark plug). The
engine converts chemical energy into kinetic energy
(which is used for motion) and heat
energy (resulting from friction).
The four strokes are
o induction stroke
o compression stroke
o power stroke
o exhaust stroke.
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