本文将说明如何使用处理程序来缓存主体、如何在出现故障时使用此缓存以及如何编写可靠的Web服务客户机。
This article will show you how to use handlers to cache the body, use this cached data in case of failure conditions, and then write a reliable Web service client.
在本文中，我将用一个简单的故障单登记(trouble - ticketing)系统说明XUL的用法，任何一个支持中心都会为它的用户提供这种系统。
In this article I illustrate XUL with a simple trouble-ticketing system, such as any support center might provide to its users.
如果在继电器中发现可燃气体，这说明有内部故障，比如过热或者电弧作用；而继电器内的空气只说明油位低或者有漏油。
Flammable gas found in the relay indicates some internal fault such as overheating or arcing, whereas air found in the relay may only indicate low oil level or a leak.
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