harder to find. 更难以寻找

91. As the world further north dried out,
    随着世界北部进一步干旱
92. it became a harsher, more difficult place to live.
    它成为了 一个更恶劣、更难以生存的地方
93. Food became more spread out,
    食物变得更分散
94. harder to find.
    更难以寻找
95. And as the Earth changed,
    随着地球的改变
96. so did the mammals.
    哺乳动物也在改变
97. Some became enormous.
    有一些变得很庞大

来自《我们星球上的生命 第一季 第七集 Life on Our Planet S01E07 地球继承者》第 94 行