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                白露 是24节气之一,此时气温开始下降,天气转凉,早晨草木上有了露水。每年公历的9月7日前后是白露。我国古代将白露分为三候:"一候鸿雁来;二候玄鸟归;三候群鸟养羞。"说此节气正是鸿雁与燕子等候鸟南飞避寒,百鸟开始贮存干果粮食以备过冬。可见白露实际上是天气转凉的象征。