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
These 150 feet high metal structures are now full of life. 这些四十五米高的金属建筑现在充满了生机
the incredible structures with which they reproduce. 便以惊人的姿态生长繁殖
Structures like these in North America's Carlsbad Cavern 北美洲卡尔斯巴德溶洞中的这些构造