dulling
n. 发暗；失光；迟钝
v. 使变钝；使沉闷；使晦暗（dull 的 ing 形式）
例句
Using the wrong wheel cleaner can lead to discoloring, dulling, and permanent staining.
使用错误的清洗液，轮胎可能褪色、裂、渍永远不能清洗掉。
The music was dull, or at least had a dulling effect on me - it didn't sparkle, or ask questions.
音乐单调乏味，起码对我是如此。没有火花，也没有疑问。
The same risk holds today, particularly if the fiscal squeeze involves incentive-dulling tax increases.
同样的风险如今依旧存在，尤其当财政紧缩手段包括了动机不明的增税时更是如此。
