最大的挑战是，此前从未有过类似的应用程序实例可作参考，所以我们不得不完全依靠自己设计软件的框架和结构。
The biggest challenge was that there had not been any instance of such an application so that we had to create all the software borders and the structure ourselves.
然而，开发一个像RUP一样的方法框架与开发一个软件应用程序并不完全一样。
However, developing a method framework like RUP is not quite the same as developing a software application.
确实，Flex出现之前有很多很酷的框架，但大多数都不易使用并且功能不完全。
Yes, there were some pretty cool frameworks before Flex, but most of them are not easy to use and not full functioned.
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