They're constantly on the move. 它们总是不停地赶路

75. The immensity of the herd can only be properly appreciated from the air.
    庞大的鹿群只有在空中 才能完全领略它的壮观
76. Some herds travel over 2,000 miles a year in search of fresh pastures.
    有的鹿群一年得走上2000多英里 才能到达新鲜草场
77. This is the longest overland migration made by any animal.
    这是动物界中最长的陆地迁徙
78. They're constantly on the move.
    它们总是不停地赶路
79. Newborn calves have to be up and running the day they are born.
    新生的小鹿必须 在出生的第一天就站起来奔跑
80. But the vast herds do not travel alone.
    但是庞大的鹿群并非独自旅行
81. Wolves.
    狼

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 78 行