are not the dominant species coming out. 在事件之后 往往威风不再
each one wiping out more than three-quarters of all life. 每一次都消灭了四分之三以上的生命
humans had spread out of Africa to almost every continent on Earth 人类已从非洲 扩散到地球上几乎每一个大♥陆♥
Before long, the walls started to crumble from the inside out... 不久之后 墙开始从内部碎裂
The Maiacetus is running out of air. 慈母鲸的氧气快用完了
One branched out and went in an entirely different direction. 有一个分支 朝一个完全不同的方向发展
strengthened to prevent silica in the grass from wearing them out... 能够防止草中的二氧化硅磨损牙齿