their muscles are always at a temperature for maximum performance... 肌肉始终保持在最佳性能的温度

305. With each giant breath,
     通过大口呼吸
306. they use oxygen far more effectively than Maiacetus.
     它们利用氧气的效率远高于慈母鲸
307. And being warm-blooded,
     而且由于是温血动物
308. their muscles are always at a temperature for maximum performance...
     肌肉始终保持在最佳性能的温度
309. ...allowing the whales to generate sustained bursts of energy.
     所以能够产生持续的能量爆发
310. When competing for a mate,
     在争夺配偶的时候
311. humpback males exploit this ability to the full...
     众多雄性座头鲸会充分利用这项能力

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 308 行