... FDL Facilities Data Link 设备数据链路 FDL Feature Definition Language 特性定义语言 FDL Figure Description Language 图形描述语言 ...
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Of course, a language feature would not be worthy of the name 'class' without supporting inheritance. The syntax for a derived class definition looks as follows.
当然，如果一种语言不支持继承就，“类”就没有什么意义。派生类的定义如下所示。
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