of a firearm; not having rifling or internal spiral grooves inside the barrel 同义词：unrifled,
A smoothbore weapon is one which has a barrel without rifling. Smoothbores range from handheld firearms to powerful tank guns and large artillery mortars.
例句与用法
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Reasonable design , big flow zone , smoothbore , no heap of dirty , small flow resistance 设计合理,流通面积大,通径平滑过渡,无脏物堆积现象,流通阻力小。
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