So whilst the female takes a well-earned break, 当轮到雌鸵鸟休息时

16. But not all of the brood have hatched.
    然而有些雏鸟还没孵化出来
17. Until they do, the family will stay here.
    在全部孵化出来前 一家子都将留在这里
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

来自《行星地球 第三季 第三集 Planet Earth S03E03 沙漠与草原》第 19 行