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

35. and eager to reach their mother,
    急切盼着来到母亲身旁
36. who's delayed feeding them on this special day.
    在这个特别的日子里 母熊已经推迟了喂奶的时间
37. Now she lures them with the promise of milk,
    现在该是履行承诺的时候了 乳汁是巨大的诱惑
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

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 38 行