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建议发展磁浮列车和发展钢质轮轨系统的两种意见在美国都有。两种根本不同的系统的设计对工程技术提出了不同的挑战。
The two opinions that suggest the development of maglev trains and the development of steel wheel and rail systems are in the United States. The design of two fundamentally different systems presents different challenges to engineering.