The private cost adds the external cost equals to the social cost.
违法社会成本是违法私人成本和外部成本之和。
The focus of this paper is to try to build URT external cost evaluation system.
本文的重心在于，分析评价城市轨道交通的外部成本。
The external-driven method is attractive for its simplicity and low cost.
外驱动同步整流方案具有电路实现简单，电路成本较低等优点。
The external-driven method is attractive for its simplicity and low cost.
外驱动同步整流方案具有电路实现简单，电路成本较低等优点。
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