这些简单的界面升级就可以使应用程序的可用性大大提高。
Simple interface upgrades like these can make a world of difference in the usability of your application.
修改也可能非常简单，如升级到最新的操作系统或应用程序版本。
Modifications can also be as simple as upgrading to the latest operating system or application versions.
尽管2级“胖客户端”应用的开发很简单，但是任何用户接口或者业务逻辑的改变所导致的软件升级都需要在所有客户端上进行。
Two-tier thick client applications are easy to develop, but any software upgrade because of changes in user interface or business logic has to be rolled out for all the clients.
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