等位价格是一条单向通行的规则。

It is a rule that works only one way.

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论文通过两个实例(一个路段、一个交叉口)单向通行前后对比分析，验证了模型的有效性和单向交通的优越性。

The efficiency and superiority of the one way street was proved by applying to the two examples (a road section and an intersection) the traffic analysis before and after using a one way street.

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最后，我们利用耦合模理论和有限时域差分技术研究了非线性缺陷对构成的光子晶体分子的单向导通行为。

Finally, we investigate the unidirectional transmission behavior of PC molecules consisting of nonlinear defect pairs by use of the coupled mode theory and the finite-difference time-domain technique.

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