The males plow into each other. 雄鲸互相冲撞

315. so she can judge their strength and stamina.
     以便雌鲸能够评估自己的力量和耐力
316. Bubble streaming
     喷出气泡
317. intimidates rivals.
     恐吓对手
318. The males plow into each other.
     雄鲸互相冲撞
319. Some get left behind,
     有的落在后面
320. still fighting.
     仍在战斗
321. The main group keeps up the chase...
     大部队继续追赶

来自《我们星球上的生命 第一季 第七集 Life on Our Planet S01E07 地球继承者》第 318 行