n. 集中者, 浓缩器, 选矿机

[计] 集线器, 集中器

[化] 浓缩器

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.]