专注的人；专心者
专注的人；专心者；集线器；集中器；一种由金属丝或硬纸制成、装在某些霰弹枪弹壳内的框架或环,发射时使弹丸聚拢以实现近距离密集射击；亦指为相同目的而将枪口内径稍微收窄的装置
专注的人；专心者
One who concentrates.
集线器；集中器
A hub.
通过间歇气流分离干燥粉碎矿石的装置
An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air.
一种由金属丝或硬纸制成、装在某些霰弹枪弹壳内的框架或环,发射时使弹丸聚拢以实现近距离密集射击；亦指为相同目的而将枪口内径稍微收窄的装置
A frame or ring of wire or hard paper fitting into the cartridge case used in some shotguns, and holding the shot together when discharged, to secure close shooting; also, a device for slightly narrowing the bore at the muzzle for the same purpose.
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