Agree. It seems impossible or too expensive to

來源: 於 2017-02-19 07:07:58 [舊帖] [給我悄悄話] 本文已被閱讀：次

transport the water via a pipe line from 貝加爾湖(海拔450米，蒙古高原海拔1580米（烏蘭巴托海拔1350米）to 蘭州(海拔1520米).