利用此射频识别钥匙，用户进入房间时能实现射频信号的对外发送。
With the radio frequency identification key, the radio frequency signal can be sent outwards when a user enters a room.
在将文档发送给计算机上可能没有智能标记识别器文件的用户时，可以使用此属性。
Use this property when sending documents to users who may not have the smart tag recognizer file on their computer.
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