In programming without metadata, you can use only one name in each program element.

如果不使用元数据编程，那么每个程序元素只能使用一个名字。

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Annotations are best for expressing the inherent characteristics of a program element.

注解是表达程序元素固有特性的最佳选择。

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Any program element - such as a variable, class, or member - can have the same name as a restricted keyword.

任何程序项目，例如变数、类别或成员，可以和限制的关键字具有相同的名称。

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Community service is another essential element of the program, and Fellows participate in service projects throughout the year in the Washington, DC area.

WHITEHOUSE: The White House

Not surprisingly, social media is a key connective element in galvanizing support for the program.

FORBES: The Collaborative Genius Behind Stand Up To Cancer

However, as was the case for the Reagan recovery, a strong dollar was an essential element of Clinton's prosperity program.

FORBES: Magazine Article