说明： DCDL:分布式控制描述语言，能以语言的方式完成对并发、进程间通信与同步和容错这3个基本功能的无二义的表达能力 (DCDL: Distributed Control description language, the language the way to completion of the complicated, inter-process communication and synchronization, and fault-tolerant three basic functions of this goes for the meaning of the expression)
