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。
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.
不要只是为了周期性的更新而强迫自己部落格。
第六章研究了弹性结构中物理非线性柱和板条周期性强迫激励的动力学响应问题。
In the sixth chapter, the dynamic responses of the nonlinear elastic pole and panel under periodic load have been studied.
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