good point. 地势确实相差不大，用deck concrete block是个好办法。

来源: 侧卫1 于 2014-11-10 12:56:48 [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.