Controls the physical layout of the fields of a class.

控制类的各字段的物理布局。

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It can be used to access fields and methods in instances of a class, giving a way of dynamically hooking together classes at runtime without the need for any source code links between the classes.

可用它来访问类实例中的字段和方法，从而提供了一种在运行时将类动态地挂钩在一起，却无需类之间有任何源代码链接的方法。

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This mechanism is the attribute structure, which basically allows all kinds of information to be associated with a class itself or with the methods, fields, and other components of a class.

这种机制就是属性结构(attribute structure)，它主要使所有类型的信息可与类本身或类的方法、字段及其他组件相关联。

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You can search obviously by any of the fields up top by days ; of the week you want a class; days of the week you don't want a class; grad level or undergrad level, faculty scores that are 4.0 and higher, ; course overall scores that are 4.0 and higher; and a whole number of other features including synchronization with Google calendar.

你可以按日期来搜索网页上的任一科目,以决定哪天去上课，哪天不去上课;,研究生课程或本科生课程,教师打分为4分或更高的课程，课程总学分为4分或者更高的课程;,当然很多其他选择方式,包括Google同步日历。

哈佛公开课 - 计算机科学课程节选

It will be widely used in a variety of computational science fields where it is expected to contribute to the generation of world-class research results.

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Historically, children from the Fields have had the right to attend primary school in Pagford, a place of flower baskets and other middle-class comforts, and the town has also supported a drug-treatment clinic that serves the neighborhood.

NEWYORKER: Mugglemarch