正在确认阅读权限…
Why Leaves Change Color in Autumn
为什么树叶在秋天会变色
-
In autumn, days get shorter and cooler slowly.秋天，白天逐渐变短、气温慢慢转凉。
-
Trees stop making green chlorophyll as sunlight drops.随着日照减少，树木停止制造绿色的叶绿素。
-
Other colors like red, orange, and yellow were always there.红色、橙色和黄色等其他颜色其实一直存在。
-
They were hidden by green chlorophyll during summer months.夏季时，它们被绿色的叶绿素掩盖了。
-
Some trees make new red pigments before leaves fall.有些树在落叶前会合成新的红色色素。
-
Wind and rain help shake loose the colorful, dying leaves.风雨帮助摇落这些色彩斑斓、即将枯萎的叶子。
-
This change is part of a tree’s yearly survival plan.这种变化是树木年度生存策略的一部分。
-
Scientists study leaf colors to track climate patterns too.科学家也通过研究叶色变化来追踪气候模式。