請將下面這段話翻譯成英文:
川藏公路
川藏公路是在古代川藏線的基礎(chǔ)上修建的公路系統(tǒng),由318國道、317國道、214國道、109國道的部分路段組成。它東起四川省成都市,西至西藏自治區(qū)首府拉薩市,是中國最險峻的公路,于1969年全部建成通車。它主要分為南、北兩條線路,是聯(lián)通西部地區(qū)和西藏高原的五條重要通道之一。
參考譯文
Chuanzang Highway
Chuanzang Highway is a highway system based on an ancient Sichuan-Tibet line. It includes portions of four national highways: G318, G317, G214 and G109. It is considered China’s most treacherous road, and stretches from Chengdu of Sichuan Province to Lhasa of the Tibet Autonomous Region. Construction was completed in 1969, and the highway is divided into a southern and northern line. Chuanzang highway is one of the five notable roads that link western regions to the Tibet Plateau.
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