reducer

• 名词，主要有两个意思：一是能把其他物质还原的化学试剂，本身在反应中被氧化，常用于摄影；二是连接不同直径管道的管件。

A noun with two primary meanings: a substance that reduces another substance while being oxidized, often used in photography; and a pipefitting that connects two pipes of different diameters.

1. Chemical reducing agentC1formaltechnical

   A substance that causes reduction in another substance by donating electrons, often used in photography to reduce the density of a negative or print.

   还原剂

   • The photographer applied a reducer to lighten the overexposed areas of the print.
   • In the chemical reaction, the reducer was oxidized as it reduced the silver halide.
   • A common reducer in photography is potassium ferricyanide.

   同义词reducing agentreductant

   反义词oxidantoxidizer

2. Pipe fittingB2formaltechnical

   A plumbing or piping component that connects two pipes of different diameters, allowing for a change in pipe size.

   异径管

   • The plumber used a reducer to connect the larger main pipe to the smaller branch line.
   • A reducer fitting is essential when transitioning between different pipe sizes in a system.
   • He installed a reducer to adapt the 2-inch pipe to the 1-inch faucet.