muzzle nozzle
枪口喷嘴
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The geometry of nozzle causes the air to reach supersonic speeds and, as a result, the gun achieved a muzzle velocity of 406 meters per second, which is about Mach 1.23!
FORBES: The Supersonic Ping-Pong Gun
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