But it's also... 但同时

37. And she begins to seal herself in.
    雌鸟开始将自己封在树洞中
38. She has turned the tree hole
    雌冠斑犀鸟将树洞
39. into a predator-proof fortress.
    打造成了一座抵御捕食者的堡垒
40. But it's also...
    但同时
41. ..a prison.
    也是一座监狱
42. Her partner, however, is a regular visitor.
    伴侣雄鸟定期前往树洞
43. For the next two months, he will deliver all her food
    接下来的两个月 雄鸟会将食物

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 40 行