You can override this method to provide a custom implementation to return a service object.

您可以重写此方法，以提供自定义实现来返回服务对象。

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A new service could return the new extension.

新服务可以返回这个新扩展。

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The new service cannot return a new extension type.

新服务不能返回新的扩展类型。

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Similarly, in crowd-funding there can be a fine line between simply asking for cash and seeking donations in return for a service or creative work.

BBC: The ethics of asking strangers to pay

The craft made a brief return to service as a ground test vehicle in 1984 before retiring to the Smithsonian's collection in 1985.

CNN: Space shuttle Enterprise flies again

He's shown this streak before, of course, most notably last September in Queens, when he repelled a Federer semifinal match point by blistering a service return for a cross-court winner.

WSJ: Jason Gay: The Underdogs Can Go Home