Which roof opens when the Sun shines?
以上内容来自专辑
- Could people live in space? 人类能在宇宙生活吗？8005:14
- Which roof opens when the Sun shines?6401:49
- Which roof opens when the Sun shines? 哪些建筑物屋顶可打开？4803:26
- Which bridge can break in two?9702:10
- Which bridge can break in two? 什么大桥可以一分为二？7204:20
- How are bridges built?12901:58
- How are bridges built? 如何修建大桥？10204:09
- 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
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