His time down here is limited by how long he can hold his breath. 它在水下的时间 受限于它能屏住呼吸的时间
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
At the same time as bats were first moving into the air, 在蝙蝠首次上天的同时
But in time, everything changed. 但是随着时间的推移 一切都改变了
It was time for the rise of the mammals. 哺乳动物崛起的时候到了
can best be seen in a world lost in time. 可以在一个迷失在时间中的世界 得以最好的展现