...allowing the whales to generate sustained bursts of energy. 所以能够产生持续的能量爆发
two-and-a-half-meter-long ancestors of the whales. 身长2.5米 是鲸的祖先
But unlike whales, they still spend much of their time lazing on land. 但与鲸不同 它们多数时间仍懒洋洋地躺在陆地上
Whales, bigger than any other animals that have ever lived. 鲸鱼是史上最大的动物
Not so long ago, these whales faced a graver threat. 不久之前 这些鲸鱼面临着更严重的威胁
But global changes now threaten the great blooms of plankton on which the whales depend. 但是全球环境的变化 让蓝鲸赖以生存的浮游生物急剧减少
three hundred thousand blue whales roamed the oceans 30万头蓝鲸让海洋看上去充满生气
Known as General Sherman, it's the weight of ten blue whales. 谢尔曼将军树有十头蓝鲸那么重
and the whales gorge themselves round the clock. 鲸鱼昼夜不停地在此进食