Zuǒlún shǒuqiāng yīn qí yuánxíng dàn cāng ér démíng.
The revolver gets its name from its circular cylinder.
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左轮 literally means 'left wheel' — referring to the rotating cylinder of a revolver. The full term is 左轮手枪 (zuǒlún shǒuqiāng), with 手枪 meaning 'pistol/handgun'.