应该丢进去微型传感器，小如米粒，掌握洞里人员流动情况。选择性堵洞。

来源: 太宇于 2023-10-25 08:20:38 [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.