More than half of China's high-speed rail which can circle the equator runs on the elevated. Why?

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[@leolee5435]

Uncle Rocket, really enjoy your programs. You are able to clearly explain very sophisticated engineering problems to a high school student. Deeply appreciated.

[@hailin8488]

也要为架桥机修一条平整的路才行吧。当然用完可以拆掉。但是未来要是需要维修或者更换某一个段落，那要怎么操作呢？

[@moseschan5149]

Crane平衡那點，未完全解釋如何操作。實際上是被吊物是要根據施工需要被吊往工地上的不同位置，對於固定的counterweight而言，實際上是靠concrete base和tower提供所需的overturning force來支撐一定程度的loading。有些tower cranes其實counterweight的位置是可以即時相應調節來作出最佳的平衡。

[@MuhammadPoohBear]

你可以直接说英文，我们能看懂。

[@leolee5435]

Thanks!

[@Tmtan]

高架不會有工程車跌入軌道的風險

[@kevinchen9068]

高架更省軌道維護與安全

[@user-gl3cx2zq7v]

抛射近地轨道大质量物体用于攻击在ACG里是普遍设定了《机动战士》里用殖民卫星撞击澳大利亚，《红色警戒3》里把轨道卫星残骸轰炸等等

[@yunsun2675]

日本高铁也沒有都架在高架上呀，日本平坦的土地少更應該用高架呀

[@wais2024]

美國搞了個亮線高鐵，為了省錢用大量平交道，結果很短時間就有一百人闖路軌撞死。

[@aronduke-pv9xo]

以桥代路

[@hayama2363]

美国还是愿意剖析事故原因

[@FreeHorse_zn]

上帝之杖貌似兔子已经试验过了，结论就是费效比太低了 还不如发导弹

[@G58LanPa]

願稱你為蛋頭博士

[@user-qp9bp1xp8s]

收音是否怪怪的?

[@qaqw9702]

架起来还有一个原因就是安全

[@tobpz4940]

高架征地少也能省成本。

[@junzhang1941]

鼻孔为何不朝天 只因下雨难冒烟 😅

[@user-jx9qf9zt1j]

高铁这玩意真的很方便，我上次去无锡坐高铁就用了十几分钟

[@DFG4508]

飛機更快更穩

[@dongtong9342]

🎉🎉🎉

[@vichau9111]

您是否忘了1986年太空穿梭機「挑戰者號」升空事故中哪七個宇航亡魂?

[@user-fl4tf6bs8i]

高架不會有土石流的災害，安全多了！

[@mingjin1853]

高 铁 高 架 高 价 三 高 嘛

[@DFG4508]

以長距離運輸飛機更安全更划算