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①轨道:railway track;permanent way.②有碴轨道:ballasted track.③无碴轨道:ballastless track.④直线轨道:straight track;tangent track.⑤曲线轨道:curved track.
① track: railway track; permanent way. ② ballasted track: ballasted track.③ ballastless track: ballastless track.④ linear orbit: straight track; tangent track.⑤ curved track: curved track.