smooth·bore /ˈsmuðˈbor, ˈbɔr/
無膛線槍,無膛線炮
Smooth·bore a. Gun. Having a bore of perfectly smooth surface; -- distinguished from rifled. -- n. A smoothbore firearm.
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smoothbore
adj : of a firearm; not having rifling or internal spiral grooves
inside the barrel [syn: unrifled] [ant: rifled]