生物学家休·丁格尔已经识别出五个特征，这些特征在不同程度和组合上适用于所有的迁徙。
The biologist Hugh Dingle has identified five characteristics that apply, in varying degrees and combinations, to all migrations.
生物学家休·丁格尔识别出符合不同程度和组合的所有迁徙的五种特征，力争了解其本质。
A biologist named Hugh Dingle, striving to understand the essence, has identified five characteristics that apply, in varying degrees and combinations, to all migrations.
演员休·杰克曼，凯特·贝金赛尔，理查·劳斯伯格和舒勒·汉斯利评论。
Commentary by actors Hugh Jackman, Kate Beckinsale, Richard Roxburgh and Shuler Hensley.
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