In her youth, she was, in fact, even more successful 事实上 这只雌熊年轻时比黑熊

180. This female has fished for salmon here for 20 years.
     这只雌性白灵熊已经在这里捕捞鲑鱼长达20年了
181. Get your timing right...
     把握好时机
182. ..and there can be great rewards.
     就会有丰富的回报
183. In her youth, she was, in fact, even more successful
     事实上 这只雌熊年轻时比黑熊
184. than the black bears.
     更擅长捕鱼
185. Perhaps her pale coat makes it difficult for the fish to see her
     也许是因为白灵熊白色的皮毛
186. against the bright sky,
     在白天不容易被鱼发现

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 183 行