为调用一个远程函数，客户程序要调用客户机存根。
To invoke a remote function, the client makes a call to the client stub.
SOAP大大简化了交换消息和调用远程函数的工作。
SOAP has significantly simplified how you can exchange messages and call remote functions.
应用程序使用远程函数调用(rfc)来调用BAPI。
An application calls a BAPI using a remote function call (RFC).
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