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軌是(shì)鐵路道(dào)軌的(de)主要(yào / yāo)組成部件。它的(de)功用在(zài)于(yú)引導機車車輛的(de)車輪前進，承受車輪的(de)巨大(dà)壓力，并傳遞到(dào)軌枕上(shàng)
