Toothed whales developed echolocation, a way to use sound waves to explore their surroundings.

齿鲸发展出了回定位能力，这是一种利用索周围环境的方法。

As its ability to echolocate evolved in power, so too did its ability to make longer jumps, which eventually turned into gliding and powered flight.

随着回定位能力的增强，进更远距离跳跃的能力也随之增强，最终演变成滑翔和动力。

Scientists think baleen whales lost the ability to use echolocation when they stopped chasing after large fish and other mammals and started eating tiny fish and plankton, which swim in large, slow-moving schools.

科学家认为，当须鲸停止追逐大型鱼类和其他哺乳动物并开始捕食小鱼和浮游生物时，们就失去了使用回定位的能力，这些小鱼和浮游生物成群结队地游动缓慢。