在国家游径系统法案的指导下，美国已建成了世界上最完善的国家游径系统。
With the guidance of the national trails system Act, America has currently developed the most mature national trails system in the world.
在国家游径系统法案的指导下，美国已建成了世界上最完善的国家游径系统。
With the guidance of the national trails system Act, America has currently developed the most mature national trails system in the world.
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