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人民网
53 分钟
樹葉為何天冷才變紅?(把自然講給你聽)
眼下,多地出現漫山紅葉的美景,令人賞心悅目。為何天變冷樹葉才會變得有紅有黃、色彩斑斕?原來,樹葉變色與氣象條件密切相關,光照和氣溫條件起著重要作用。
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今日热点
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Kentucky plant explosion
Recalling pickups, SUVs
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