You can change their color, how much light they reflect.

你可以改变它们的颜色，反光强度。

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They can change the color of their skin.

他们可以改变皮肤颜色。

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Many fruits change color as they reach maturity and this can be a useful indicator.

许多水果成熟时颜色会变，这是一种很有用的标示。

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Or,they can be more complex such as using liquid glazes to change the color or shininess of the clay surface.

VOA: special.2009.09.09

As the viruses change color once they've reached impervious bacterial strains, in this case variants on Staphylococcus, they can reveal superbugs within 10 to 12 minutes -- a potentially lifesaving interval when current purification-driven methods can take hours.

ENGADGET