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。

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Discoloring impurities lowers the brightness of kaolin and limits its use.

致色杂质降低了高岭土的亮度并限制了它的应用范围。

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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。

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We can see oil discoloring the ocean, blackening coastlines and covering wildlife, but carbon dioxide is colorless and odorless.

CNN: What if carbon dioxide were as black as oil?

The all-pervasive sea water still left its mark, seeping into the frames and discoloring them with salt stains and algae.

CNN: March 11, 2013 -- Updated 1910 GMT (0310 HKT)

Over the next several months, the erstwhile housepainter whitewashed the brick, discoloring his lime with pigment to give the walls an ancient tint.

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