单词	pendulum gun
释义	pendulum gun noun : a mechanism for obtaining certain ballistic data for given shotshell loadings that consists of a tube fitted with a breech and a firing mechanism and moving freely on its four supporting wires and that by means of attached and coordinated instruments determines velocity, time required for shot charge to pass through barrel, chamber pressure, energy of recoil, and shot pattern Word History Etymology so called from its motion when fired
随便看	tone row tone syllable tone up tone wheel tone-deaf tone-setter tone-up tonearm tonearms toned toned (up) toned up toned-down Tonegawa toneless tonelessly tonelessness tonelessnesses toneme tonemes tonemic tonepads toner toners tones

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