until the young have grown and fledged. 直到它们羽翼已丰

50. The food he has brought has enabled her to produce
    雄鸟提供充足的食物帮助雌鸟产下
51. two precious eggs.
    两枚珍贵的蛋
52. She will keep them safe for another six weeks
    接下来的六周内 雌鸟将保护雏鸟的安全
53. until the young have grown and fledged.
    直到它们羽翼已丰
54. And then, both she and they
    随后 冠斑犀鸟母子
55. will break out of their confinement.
    将破开束缚 翱翔天际
56. But until then...
    但在那之前

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 53 行