1·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。
2·The method is based on the catalysis of phenanthroline to the discoloring reaction of bordeaux R oxidized by potassium periodate in the dilute acetic acid solution.
1·And, in fact, some algae can be harmful without discoloring the water.
而事实上，有些藻类可以有害却不会使水变色。
2·Practice indicates the problems in quality such as crushing, wrinkling and shelling, discoloring and fading can be solved by taking appropriate measures.