and kept warm beneath the downy bulge of its stomach. 依靠耷拉下来的肚皮上的绒毛保持温暖

12. The penguins stay when all other creatures have fled
    其它动物早已逃离 只有企鹅留了下来
13. because each guards a treasure:
    因为每只企鹅都护卫着一件宝贝
14. a single egg rested on the top of its feet
    一颗躺在它们脚背上的蛋
15. and kept warm beneath the downy bulge of its stomach.
    依靠耷拉下来的肚皮上的绒毛保持温暖
16. There is no food and no water for them,
    它们没有食物 也没有水
17. and they will not see the sun again for four months.
    而且整整4个月见不到太阳
18. Surely no greater ordeal is faced by any animal.
    这绝对是动物们经受过的最严酷的考验

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 15 行