Definition: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Input: The four-stroke engine is an internal combustion engine .
Output:
A four-stroke ( also four-cycle ) engine is an internal combustion ( IC ) engine in which the piston completes four separate strokes while turning the crankshaft .