短語詞組短語ballasted sleeper track 道渣軌枕軌道ballasted track structure 鋪碴軌道結(jié)枸Non -ballasted track 無碴軌道ballasted track on bridge 橋上有砟軌道improved ballasted track 經(jīng)改進(jìn)的有渣軌道Slab non -ballasted track 板式無碴鉄軌rolling noise of non -ballasted track 無碴軌道滾動噪聲 返回 ballasted track