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concentrator    
n. 使集中的人,浓缩器,选矿机

使集中的人,浓缩器,选矿机

concentrator
汇集器; 集讯机

concentrator
集中器 集线器

Concentrator \Con"cen*tra`tor\, n. (Mining)
1. An apparatus for the separation of dry comminuted ore, by
exposing it to intermittent puffs of air. --Knight.

2. (Firearms) 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.
[Webster 1913 Suppl.] Concentric


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