齒條與小齒輪鐵路 - PanSci 泛科學
Friday, October 17, 2014 by JSDN
在瑞士坐了很多這樣的小火車
這些獨特的大眾運輸系統如何能讓沉重的火車頭爬上比以往更陡峭的山坡?
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這些獨特的大眾運輸系統如何能讓沉重的火車頭爬上比以往更陡峭的山坡?
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Friday, October 17, 2014 by JSDN
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