left Africa millions of years earlier 在数百万年前离开非洲

57. including the largest and most iconic of them all...
    包括其中最大、最具代表性的…
58. ...woolly mammoths.
    真猛犸象
59. Their elephant-like ancestors
    它们与大象相似的祖先
60. left Africa millions of years earlier
    在数百万年前离开非洲
61. and evolved into these highly specialized beasts.
    进化成了这些高度专门化的巨兽
62. Long hair, smaller ears, and shorter tails
    长毛 小耳 短尾
63. help them conserve heat in the cold.
    有助于在寒冷的环境中保温

来自《我们星球上的生命 第一季 第八集 Life on Our Planet S01E08 冰与火的世纪》第 60 行