特点是要发送数据则立即发送，由集线器避免冲突。
The character of this method is to send data immediately when the data is ready and to avoid the collision with the hub.
原因是，无线装置要发送数据并等待来自接收数据的另一个无线装置的应答。
The reason is that one radio will send out data and wait for an acknowledgment from the other radio that the data was received.
该数据库有一部分称为密钥存储区，它包含用于对要发送的数据进行签名的所有证书。
The database has one section called the key store that contains all of the certificates that could be used to sign something to be sent out.
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