这些扩展点定义动作的标签，并将平台指向当从菜单中选择动作时所运行的代码。

These extension points define the label for the actions and point the platform to the code that runs when the actions are selected from the menu.

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策略是确定的路线或从选择物中选择动作的方法，并在给定条件的指引下指导及确定决策。

A policy is a definite course or method of action selected from alternatives, and in light of given conditions, to guide and determine decisions.

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We're exhausting all possibilities. And then choosing the winner. Well, that's what the slow thief tried. Unfortunately it took so long that before he finished the owner returned home, called the police and the thief ended up in jail.

我们穷举了所有可能方案,然后选择最优方案,这就是动作慢的贼的方案,不幸的是它在失主回家之前，要花上了太长的时间。

麻省理工公开课 - 计算机科学及编程导论课程节选