Their lanky legs are a sure sign 高鼻羚羊四肢瘦长

24. For these calves, the clock is already ticking.
    对这两只小羊来说 时间紧迫
25. Their herd will soon be moving on,
    羚羊群很快就要离开
26. seeking the freshest new grass.
    去寻找最新鲜的草场
27. Their lanky legs are a sure sign
    高鼻羚羊四肢瘦长
28. that they're built for a life on the move.
    预示着它们一生都将奔波在路上
29. Saiga always give birth to twins,
    高鼻羚羊总会产下孪生幼崽
30. so their numbers grow rapidly just when grass is plentiful.
    这样能够在草源充足时迅速繁衍

来自《行星地球 第二季 第五集 Planet Earth S02E05 草原》第 27 行