The consumer can't just put a request on any request channel; it has to know the right channel to use to invoke the particular service it needs.

使用者不能将请求随便放到一个请求通道中，它必须知道用于调用其所需的特定服务的合适通道。

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The WSDL associated with a request channel would describe what service that channel provides as well as the format of the request message the consumer must provide.

与请求通道相关的WSDL描述通道提供什么服务，以及使用者必须提供的请求消息的格式。

youdao

The caller can't just put any request message format on any request channel; it has to know exactly the right message format and channel for the specific service it wishes to invoke.

调用方不能将所有的请求消息格式都放置在任何一个请求通道上；它必须准确地知道希望调用的特定服务的正确消息格式和通道。

youdao

He is due to return to London, with a welcome at the House of Lords, Wednesday afternoon, after taking the ferry from Calais to Dover because his request to walk through the Channel Tunnel was refused on safety grounds.

WSJ: Olympic Peace Walk From Greece to London Survives Its Waterloo

DirecTV initially wanted to put the channel on a specialty tier that subscribers would have to request to see, but Time Warner Cable was greatly opposed to that because it would limit revenue from subscription fees and advertisers.

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