Page description language is a new kind programming language with powerful graphics description ability.

页面描述语言是一种新型的程序设计语言，具有很强的图形描述功能。

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The Real Time Programming language is considered as system description language with temporal constraints.

实时编程语言是有时间约束的系统描述语言。

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The Real Time Programming language is considered as system description language with temporal constraints.

实时编程语言是有时间约束的系统描述语言。

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