The service needs to receive input parameters from the external client and return output parameters to it and define this in WSDL.

服务需要从外部客户端接收输入参数，并将输出参数返回到它，同时在 WSDL 中对此进行定义。

youdao

Having defined the operations (or methods), you now need to specify the parameters that you will send to them and the parameters that they will return.

定义好操作(或方法)以后，现在需要指定将向它们发送和从它们返回的参数。

youdao

The server simply unpacks the parameters of the request, performs the operation, packages up the return value and out parameters, and sends the response back to the client.

服务器只是将请求中的参数解包，执行运算，将返回值和输出参数打包，然后向客户机发回响应。

youdao

Two, the arguments or parameters, and three, is the return value.

第二个，参数和参量，还有三，是那个返回值。

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