有一個問題我很關心，那就是沙漠治理。中國沙化越來越嚴重，能否有辦法阻止並改造它

來源: baiwen 於 2017-12-24 08:45:22 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.