求翻译：途经纳赤台、昆仑山、五道梁、沱沱河、雁石坪，翻越唐古拉山，再经西藏北部高原上的安多、那曲、当雄、羊八井，一路向南到达拉萨。它穿越550多公里的多年冻土地段，全线平均海拔在4500米以上，最高路轨横跨海拔高程达5072米的唐古拉山垭口。这条钢铁大动脉总投资262.1亿元，计划2006年铺通，2006年7月1日全线建成通车。是什么意思？

Through Nachitai, the Kunlun Mountains, five beams, Tuotuohe, Yanshiping, crossing the Tanggula, then by the Tibetan plateau north of Amdo, Nagqu, when the male, Yangbajain, all the way south to Lhasa. It is through the more than 550 km of permafrost locations, across the board an average elevation

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正在翻译，请等待...

Via Nano at Chek Lap Kok, Kunlun Shan, five beam, tuotuo River, goose pavement, crossed the tanggula and then by a northern Tibet plateau up Ando, nagqu and when, the yangbajain, to the South all the way to dalasa. Passage more than 550 km for permafrost areas, full average elevations 4,500 meters a

Through Nachitai, the Kunlun Mountains, five beams, Tuotuohe, Yanshiping, crossing the Tanggula, then by the Tibetan plateau north of Amdo, Nagqu, when the male, Yangbajain, all the way south to Lhasa. It is through the more than 550 km of permafrost locations, across the board an average elevation