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Why Leaves Change Color in Fall
为什么秋天树叶会变色
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Leaves turn red, orange, and yellow as days grow shorter.白昼变短，树叶转为红、橙、黄三色。
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Sunlight triggers green chlorophyll all spring and summer.整个春夏季，阳光促使叶绿素持续生成，使叶子保持绿色。
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In autumn, trees stop making chlorophyll to save energy.秋季，树木停止制造叶绿素以节省能量。
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Other pigments like carotenoids and anthocyanins become visible.类胡萝卜素和花青素等其他色素因而显现出来。
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Rain, temperature, and sunlight affect color intensity each year.每年的降雨、气温和光照都会影响叶色浓淡。
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Maple trees make bright reds when sugar gets trapped in leaves.糖分在枫树叶片中积聚时，会形成鲜艳的红色。
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This natural process helps trees prepare for winter rest.这一自然过程帮助树木为冬季休眠做准备。
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It’s a beautiful sign of seasonal science in action.这是季节更替背后科学原理的美丽呈现。