In the sample application, the design calls for the Preference screen to be invoked using a menu item.
在样例应用程序中，设计要求Preference屏幕使用菜单项进行调用。
2
In a production environment, a string that is a configuration item should be externalized as an Eclipse preference.
在生产环境中，应该将作为配置项的字符串具体化为一个Eclipse首选项。
3
“A company can exploit customers’ preference for the middle item, ” says Simonson, “by presenting a more expensive item next to the one it is really trying to sell.”