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①线路机械和机具:lrack work machine and mechanism.②重型(轻型、小型)线路机械:heavy(light,small)track work machinc.③轨行式线路机械:on-track track work machine;rail-mounted track work machine.
① line machinery and equipment: lrack work machine and mechanism. ② heavy (light, small) line machinery: heavy (light, small) track work machinc.③ rail line machinery: on-track track work machine; rail-mounted track work machine.