客户机使用消息传送来指定目标对象、消息和参数集。
Using message passing, a client object specifies a target object, a message, and a set of arguments.
如果未指定该选项，目标对象的所有者就是所连接的用户。
If the option not specified, the owner of the target objects is the connected user.
表间关系、主键列和其他有关目标数据的信息也是通过元数据对象指定的。
Inter-table relationships, primary key columns, and other information about the target data is specified through the metadata object as well.
send方法创建一个默认传输对象和一个SNMP对象，指定关于目标SNMPManager的信息，并调用SNMP对象上的send方法。
Method send creates a default transport object and an SNMP object, specifies information about the target SNMP Manager, and calls the send method on the SNMP object.
对象，它指定将使用的目标语言。
目的地是客户用来指定它生产的消息的目标和它消费的消息的来源的对象。
Destination: an object to which messages are addressed and sent and from which messages are received.
目的地是客户用来指定它生产的消息的目标和它消费的消息的来源的对象。
Destination: an object to which messages are addressed and sent and from which messages are received.
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