The strength she loses, the calf gains. 将自身的力量传递给了孩子

139. A new life begins.
     新的生活开始了
140. The calf is totally dependent on its mother.
     幼鲸将完全依赖于它的母亲
141. She's producing as much as 200 litres of milk a day.
     雌鲸每天分泌多达200升乳汁
142. The strength she loses, the calf gains.
     将自身的力量传递给了孩子
143. And it becomes more and more independent and playful.
     幼鲸得以越来越独立与活泼
144. In this nursery bay, there are plenty of playmates.
     在这片育婴海湾中 能找到很多玩伴
145. But a mother never lets her calf stray too far...
     但母亲不会让幼鲸跑得太远

来自《行星地球 第三季 第一集 Planet Earth S03E01 海岸》第 142 行