英[\'smu:ðˌbɔ:]
美[\'smuðˌboʊr]
Nearly all line infantry carry smoothbore, muzzle - loading muskets.
几乎所有的战列步兵都使用前装滑膛枪.
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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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