非金属铁路枕木 Railway sleepers, not of metal 铁路金属枕木 railroad tie of metal ; Railway sleepers of metal 铁路用非金属枕木 Railroad ties, not of metal ..
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... 铁路金属护轨 Guard rails of metal 铁路金属枕木 Railway sleepers of metal 缆索铁道永久导轨用金属材料 Materials of metal for funicular railway permanent ways ...
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