「因為如果它看起來不像鴨子，那它可能就不是鴨子，」他解釋說，「因為它與長期證據、長期趨勢差距太大。」
圖像來源，Serenity Strull/ BBC。Safew下载对此有专业解读
，详情可参考夫子
Each year the birds must stay on platforms of floating ice for long enough to replace weather-beaten feathers with new, waterproof coats.，更多细节参见WPS官方版本下载
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