It is a palm-size side card, in addition to a room, and other functions sure, but also a small inlay columns, meeting again with their hands, into the red, white room vacant, then back.

• 它是一个巴掌大的方牌，除了具有和其它房间一样的功能标注外，还嵌有一个小圆柱，会议时用手一拨，转成红色，房间空闲时再转回白色。