控制字是一种特殊的RTF用来标记打印机控制符的格式化命令，也是程序用来管理文档样式的格式化信息。
A control word is a specially formatted command that RTF USES to mark printer control codes and information that applications use to manage documents.
包成员可以使用可见性修饰符来标记，以控制对成员的访问。
Package members may be marked with visibility modifiers to help control access to the member.
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