This unmasking explains the autumn colours of yellow and orange, but not the brilliant reds and purples of trees such as the maple or sumac.
这一发现解释了秋天的颜色是黄色和橙色，而不是像枫树或漆树那样明亮的红色和紫色。
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Spotted fever in purples for example, which we call measles, was a significant cause of death as was the plague, which we don't have anymore, thank goodness.