He gently rolls the unhatched eggs... 它轻轻的晃动尚未破壳的蛋

18. The adults take it in turns to protect the brood.
    成年鸵鸟轮流负责保护雏鸟
19. So whilst the female takes a well-earned break,
    当轮到雌鸵鸟休息时
20. the male takes over for the most testing shift.
    雄鸵鸟就会接手这项辛苦的工作
21. He gently rolls the unhatched eggs...
    它轻轻的晃动尚未破壳的蛋
22. ..calling to the young within them.
    呼唤里面的雏鸟
23. He doesn't want to leave anyone behind.
    它不想落下任何一个孩子
24. The temperature continues to rise by five degrees Celsius every hour.
    温度持续上升 每个小时升高5摄氏度

来自《行星地球 第三季 第三集 Planet Earth S03E03 沙漠与草原》第 21 行