Currently, there are 15 arterial highways and 315 feeder roads, with a total length of 21,842 km, throughout Tibet.是什么意思_Currently, there are 15 arterial highways and 315 feeder roads, with a total length of 21,842 km, throughout Tibet.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句