这个例子使用了由XMethods支持的“书价检验程序”Web服务，该服务返回请求中给定isbn的书的价格。
This example USES the "book price checker" Web service hosted by XMethods, which returns the price of the book whose ISBN is listed in the request.
再见，新闻网站链接，你好，“即时文章”——同样的事情，由脸书的服务器提供，在脸书的应用程序并(通常)打了脸书的广告。
Goodbye links to news sites, hello "Instant Articles" - the same thing, but served from Facebook's servers, in Facebook's app and (often) with Facebook's adverts.
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