reducer
 減徑管,縮減者,還原劑,減速器


 reducer
 縮減器


 Re·du·cer n.
 1. One who, or that which, reduces.
 2. Mach. (a) A contrivance for reducing the dimensions of one part so as to fit it to another, as a reducing coupling, or a device for holding a drilling a chuck. (b) A reducing motion. (c) A reducing valve. (d) A hydraulic device for reducing pressure and hence increasing movement, used to transmit the load from the hydraulic support of the lower shackle to the lever weighing apparatus in some kinds of heavy testing machines.
 3.  Photog. A reducing agent, either a developer or an agent for reducing density.

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 reducer
      n 1: a substance capable of bringing about the reduction of
           another substance as it itself is oxidized; used in
           photography to lessen the density of a negative or print
           by oxidizing some of the slackened silver [syn: {reducing
           agent, reductant]
      2: pipefitting that joins two pipes of different diameter