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Why Do Some Trees Lose Leaves in Autumn While Others Stay Green?
为什么有些树秋天落叶，而另一些树却四季常青？
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Deciduous trees drop leaves to save water during cold, dry winters.落叶树在寒冷干燥的冬季落叶以节约水分。
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Evergreen trees have thick, waxy leaves that resist drying out.常绿树叶片厚实、表面覆蜡，不易失水。
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Pine needles contain oils that prevent freezing damage.松针含有防冻油，可防止冻害。
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Both types make food using sunlight, but manage resources differently.两类树木都利用阳光制造养分，但资源管理方式不同。
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Leaf loss helps deciduous trees avoid branch breakage from snow.落叶有助于落叶树避免积雪压断枝条。
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Evergreens keep leaves for two to five years before replacing them.常绿树的叶子可保留两到五年才更新。
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Soil type and rainfall also shape which trees grow where.土壤类型和降水量也影响树木的分布。
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Nature chooses the best leaf strategy for each climate and soil.自然为每种气候和土壤选择最适宜的叶片策略。