Typically, most machines connected to the Internet have two connections: a local loop to themselves and a connection to their local service provider.

通常，连接至因特网的大多数机器中有两个连接：到其自身的本地循环和到其本地服务供应商的连接。

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A: Try Loop PDF - it's a free service that lets you combine multiple documents, images and even web pages into a single PDF file.

A：你可以试试Loop PDF，他们提供免费服务，可以将多个文档、图片、甚至网页合并进一个PDF文件。

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Thus, whenever the service returns true, the loop exits and the Reply activity runs.

这样，在服务返回True时就会退出循环，接着运行Reply活动。

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American Express says it is uniquely positioned to offer the service thanks to its "closed-loop" business model in which it acts as card issuer, merchant acquirer and payment processing operator.

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In this context, a network effect is a positive feedback loop whereby platforms with stronger ecosystem of developers, content and service providers attract more customers.

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Oltio is a mobile payment service provider based in South Africa and will offer MasterCard?s open loop and remote payments solutions to merchants in the country.

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