so she can judge their strength and stamina. 以便雌鲸能够评估自己的力量和耐力
and it's in no hurry to make its move. 而且它并不急于行动
One branched out and went in an entirely different direction. 有一个分支 朝一个完全不同的方向发展
his cubs will leave their mother and start to hunt alone, 它的幼崽将离开母亲 开始独自捕猎