con·cen·tra·tor /ˈkɑn(t)sənˌtretɚ/
  使集中的人,濃縮器,選礦機
  con·cen·tra·tor /-ˌtretɚ/ 名詞
  集中者,濃縮器,聚能器
  concentrator
  匯集器; 集訊機
  concentrator
  集中器 集線器
  Con·cen·tra·tor n. Mining
  1. An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air.
  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.
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