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    冬天有沒有蟋蟀?

    作者: 阮一峰

    日期:2006年10月25日

    晚上睡覺前,我隨手拿起一本英詩選,正好翻到濟慈(John Keats)的《蟋蟀與蟈蟈》(On the Grasshopper and Cricket),里面有這樣的詩句:

    在一個寒冷的冬夜,嚴霜
    覆蓋大地,一片寂靜,
    爐邊傳來了蟋蟀的鳴叫

    我突然很好奇,我從沒有在冬天聽到過蟋蟀的鳴叫。古人說“夏蟲不可語冰”,難道蟋蟀可以活到冬天?

    我接著想到,狄更斯的《圣誕故事集》里有《爐邊蟋蟀》(Cricket on the hearth),《木偶奇遇記》中匹諾曹在冬天打死了一只蟋蟀。莫非冬天真的能聽到蟋蟀叫?

    搜索引擎里面關于蟋蟀的壽命,內容非常少。可以確證的是,如果人工精心飼養,蟋蟀是有可能活到圣誕節的。但是,屋中的野生蟋蟀,這樣的可能性是很小的。

    另一方面,根據維基百科,蟋蟀鳴叫的頻率與氣溫有關,攝氏13度時,蟋蟀每分鐘叫60次。氣溫越高,蟋蟀叫得越歡;氣溫越低,鳴叫的間隔越長。這被叫做 Dolbear's Law,還有一個計算公式:

    T = 10 + (N - 40) / 7

    其中,T 表示攝氏度,N 表示蟋蟀每分鐘鳴叫的次數。

    根據這個公式,不難發現攝氏4.3度以下時,蟋蟀應該是不叫的。

    總之,我很懷疑濟慈或狄更斯是否真的在爐邊聽到了蟋蟀叫。如果確實聽到了,那么他們必然遇到了一只強健耐寒的蟋蟀,而且屋中的溫度一定高于4.3度。

    最后生成于 2018-7-9 07:41:56

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