An example of this is when a service provider accesses multiple back-end systems with different timeout requirements, but only determines at run time which back-end is invoked.

此类示例包括服务提供程序访问多个带有不同超时需求的后端系统，但仅在运行时才确定调用哪个后端系统。

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Next time, we will create a Web service that shields front end PHP code from the back end MySQL system in which the account information is stored.

下次我们将创建一个Web服务，它对前端PHP代码隐藏了存储账号信息的后端MySQL系统。

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Now that you've seen the back-end service that the Web application will use, it is time to look at the front end that USES it.

既然我们已经了解了Web应用将使用到的后台服务，接下来我们将了解它使用到的前台。

youdao

Now that you've seen the back-end service that the Web application will use, it is time to look at the front end that USES it.

既然我们已经了解了Web应用将使用到的后台服务，接下来我们将了解它使用到的前台。

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