Back at her nest, the scout summons an army of her own. 侦察兵从巢穴召集了一支军队
Simple feather-like structures first appeared back in the Triassic. 简单的类似羽毛的结构 最早出现在三叠纪
Turtles first evolved back in the Triassic. 海龟最早是在三叠纪时期进化而来
turtles went back to the seas their ancestors left, 海龟回到了祖先曾离开的大海
was when some of them turned their back on the land 也许是其中一些动物放弃陆地
This is an echo of what life was like back in the Triassic. 这是三叠纪时期生活的历史回声