Now she converts the last of her fat reserves into milk for her cubs. 现在它将仅剩的一点脂肪 变成乳汁喂养它的宝贝们

38. the only food the cubs have known since they were born deaf and blind beneath the snow some two months ago.
    自从熊崽们两个多月前又聋又瞎地 在雪下出生以来 母乳就是它们唯一的食物
39. Their mother has not eaten for five months
    它们的母亲已有5个月没有进食了
40. and has lost half her body weight.
    失去了一半的体重
41. Now she converts the last of her fat reserves into milk for her cubs.
    现在它将仅剩的一点脂肪 变成乳汁喂养它的宝贝们
42. The spring sun brings warmth
    春天的太阳带来了温暖
43. but also a problem for the mother.
    但对母熊而言却是一个问题
44. It starts to melt the sea ice.
    海面的冰层开始融化

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 41 行