It is one of several mutations such as hair colour, baldness, freckles and beauty spots, which neither increases nor reduces a human's chance of survival.

它是众多突变中的一种，如同发色、脱发、雀斑和美人痣，既没有增加也没有减少人类的生存机会。

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The researchers say in contrast, the colour sensor is cheap and easy to read as the spots on the sensor change colour according to the chemicals with which they come into contact.

研究人员认为，与以上检查不同的是，彩色传感器便宜而且结果容易识别。

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In order to tell the bees apart, he painted some bees with little spots of colour.

为了便于区别，他在一些蜜蜂身上点上颜色。

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"Complex colour patterns such as spots and stripes are common in nature but the way they are formed is poorly understood, " said Dr Kathy Schwinn of the New Zealand Institute for Plant and Food Research.

BBC: A bumblebee extracting nectar and pollen from a snapdragon