MbMessage对象用于创建输出消息树、环境树、本地环境树、异常列表树等等。
MbMessage object is used to create output message tree, environment tree, local environment tree, exception list tree, etc.
如果节点的输入树具有一个本地环境，其中包含 $LocalEnvironment/TCPIP/Receive/Length 值，那么该值将控制将要读取的字节数。
If the input tree to the node has a local environment including a value for $LocalEnvironment/TCPIP/Receive/Length, then this value controls the number of bytes to be read.
如果节点的输入树具有一个本地环境，其中包含 $LocalEnvironment/TCPIP/Receive/Length 值，那么该值将控制将要读取的字节数。
If the input tree to the node has a local environment including a value for $LocalEnvironment/TCPIP/Receive/Length, then this value controls the number of bytes to be read.
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