- 考证，这是我国最早的监听设备，又名监听缸，此物有六百多年历史，埋在墙角，以碗柜掩盖，可听到五十米外的脚步声，用来防盗。
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牌靴換牌@13710079688
牌靴換牌@13710079688
牌靴換牌@13710079688
牌靴換牌@13710079688
- com/newsapp_bt/0/12406311998/1000" class="content-picture">
骄傲的胡子（Pride moustache），Saurabh Sirohiya
