they need little energy to keep warm... 所以它们不需要多少能量 就能保持温暖
...allowing the whales to generate sustained bursts of energy. 所以能够产生持续的能量爆发
That means these babies need plenty of energy. 这意味着这些宝宝需要足够的能量
But all this activity comes with a huge thirst for energy. 但所有这些活动都需要大量的能量
...so can focus all his energy on finding a mate. 所以可以把全部精力放在觅偶上
This means they can harness the sun's energy to grow, 这意味着 它们能够利用太阳的能量生长