他们对老鼠的脑组织进行染色，这样不同种类的突触就可以呈现不同颜色。
They stain the mouse's brain tissue, so that different kinds of synapses show up in different colors.
牙齿慢性龋将趋于较深的颜色，因为边缘龋洞被正常吃的食物所染色。
Teeth with chronic caries will tend to be darker in color because the edges of the cavities become stained from normal eating and drinking.
人造奶油本身有一种灰颜色，需要染色来给它黄油的颜色。
Margarine has a grayish color and needs to be dyed to give it the color of butter.
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