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单轨火车曾被发明出现过，为什么我们乘坐的火车却没有单轨的？

Name: %E5%8D%95%E8%BD%A8%E7%81%AB%E8%BD%A6%E6%9B%BE%E8%A2%AB%E5%8F%91%E6%98%8E%E5%87%BA%E7%8E%B0%E8%BF%87%EF%BC%8C%E4%B8%BA%E4%BB%80%E4%B9%88%E6%88%91%E4%BB%AC%E4%B9%98%E5%9D%90%E7%9A%84%E7%81%AB%E8%BD%A6%E5%8D%B4%E6%B2%A1%E6%9C%89%E5%8D%95%E8%BD%A8%E7%9A%84%EF%BC%9F
Uploaded: 2024-05-20T05:36:57.047Z