弹头底部边沿呈斜角形,以利重装时枪弹时塞入弹壳拜见平底式(plain base)
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Plain base on valve seat 平底式阀座
base level plain 基面平原
base-leveled plain [地理] 基准面平原
Plain n base 平底式
base-isolated plain sliding systems 平面滑移隔震系统
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The town lay on a flat plain at the base of an Allegheny Mountain valley so steep that the hillsides rose straight upward along the Little Connemaugh River.
VOA: standard.2010.04.26
They are plain vanilla type expansions of the tax base.
FORBES: Jobs Bill Should Pass, Says Tax Expert Gordon
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