The goal is to avoid incurring the computative cost of running the query every time the backing bean accessor is consulted.
其目的是避免每次咨询支持bean的访问函数时 带来运行查询的计算成本。
The study looked at practices like backing up data, using password protection, and running virus scans, and ranked 35 big cities across the U.S. based on its survey.
此研究涉及的调查项目包括数据备份，用户密码保护以及运行病毒扫描，根据其调查结果对美国35个大城市进行了排名。
As you can see in the screenshot, because my machine is running XP, Upgrade Advisor is recommending backing up all of the data on it, as it will require a clean install of Windows 7.
正如你在截图中看到的，由于我的机器运行的是xp，升级助手推荐我在xp中备份所有的数据，同样它也要求一个Windows7的全新安装。
As you can see in the screenshot, because my machine is running XP, Upgrade Advisor is recommending backing up all of the data on it, as it will require a clean install of Windows 7.
正如你在截图中看到的，由于我的机器运行的是xp，升级助手推荐我在xp中备份所有的数据，同样它也要求一个Windows7的全新安装。
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