The system with unknown input is translated into an equivalent system without unknown input by a simple algebraic transformation.

通过一个简单有效的代数变换，将具有未知输入的系统变换成一个不含未知输入的等价系统；

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Japan has no equivalent system to rank the fish on supermarket shelves as either red, for endangered, yellow or green, for plentiful, he pointed out.

他指出，日本没有在超市货架上标明任何一个等级的相应的系统，像表示濒危的红色，黄色或绿色。

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Test results show that the dynamic performance of equivalent system agrees well with that of brick masonry structure with sliding base isolation below seven stories.

试验分析结果表明：等代体系能较好地反映七层以下基础滑移隔震砖房的动力性能。

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Gaining access to the system is the equivalent of learning how to operate a filing system, and not accessing the information contained inside, the person familiar with the matter said.

WSJ: Google Attackers Gained Access to Computer Code

But why does Europe need its own "sat nav" system when the rest of the world uses GPS or an equivalent Russian or planned Chinese system?

BBC: NEWS | UK | UK Politics | Galileo: Star project or black hole?

Inflation destroys the middle class, the social equivalent of a levee system, and then the floods come.

FORBES: The Inflation Intifada: Hunger And Revolution In The Third World