其实很多地方不用真的建墙。直接撒几个Drone出去巡逻就是了。

来源: soullessbody 于 2016-11-09 11:40:30 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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