Agree. It seems impossible or too expensive to

来源: 于 2017-02-19 07:07:58 [旧帖] [给我悄悄话] 本文已被阅读：次

transport the water via a pipe line from 贝加尔湖(海拔450米，蒙古高原海拔1580米（乌兰巴托海拔1350米）to 兰州(海拔1520米).