Why are tunnels round? 为什么隧道是圆的？
以上内容来自专辑
- Why are tunnels round?11302:22
- Why are tunnels round? 为什么隧道是圆的？10304:47
- Why are some buildings knocked down?7502:12
- Why are some buildings knocked down? 为什么拆除某些建筑物？9004:17
- Which are the world's tallest buildings?6501:39
- Which are the world's tallest buildings? 世界上最高的建筑是哪些？6306:00
- Which are the tallest cranes?11202:06
- Which are the tallest cranes? 哪种起重机最高？9504:26
- Do buildings have a skeleton?9301:50
- Do buildings have a skeleton? 建筑物有骨架吗？6703:56
用户评论
还没有评论，快来发表第一个评论！
© 2014-2024 喜马拉雅 版权所有