A more practical approach to cost-based spam is to force someone sending E-mail or Posting a message to expend a non-trivial amount of CPU cycles in order to do so.

基于成本的一种更实用的垃圾信息抵御方式是强迫发送电子邮件或发布信息的人为此支付数量可观的一些CPU周期。

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This paper describes a new approach to robot path planning:the transition cost matrix based approach.

本文描述了机器人路径规划的一种新方法：基于转移费用矩阵的机器人路径规划方法。

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The approach based on linear Hall device, without increase in the cost, simple installation and the results meet to the requirement.

该方法基于线性霍尔元件，基本上不增加控制系统成本，安装简便，效果良好。

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The airline industry likes the cost-based approach to the plan because it provides 94% of the FAA's trust fund revenue but accounts for only 73% of its air traffic control costs.

FORBES: Magazine Article

Model programmes in juvenile-justice reform do exist: the Missouri Division of Youth Services, for example, uses a relatively low-cost, individualised, community-based approach with recidivism rates consistently hovering around 10%, one of the lowest in the country.

ECONOMIST: America behind bars