desultor

例句：

1. 1. The paint was left on the walls for too long, causing them to become a bit dull and yellowish.
   油漆留在墙上的时间过长，导致它们变得有些暗淡和黄色。
2. 2.To remove the stains from the fabric, we need to use a decolorizer.
   为了从布料上去除污渍，我们需要使用脱色剂。
3. 3. The chemical used as a decolorizer is harmful to humans and the environment.
   用作脱色剂的化学物质对人类和环境有害。