Some regional security experts say the organization's core principle of not interfering in the internal affairs of its members limits its effectiveness.

一些地区安全专家说，该组织不干涉成员国内政的核心原则限制了其有效性。

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On the basis of the principle of polarization coding and correlative detection, computer simulation is done for the ideal coded signal and real data, the results prove the effectiveness of the method.

在介绍极化编码及相关检测原理的基础上，利用理想编码信号和实际数据进行了计算机仿真，仿真结果证明了此方法的有效性。

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The comparative analysis in this paper is backed up by the following understandings concerning precaution and the effectiveness of precaution: 1 precaution is different from precautionary principle.

文中比较分析的构建以对风险预防和风险预防有效性的如下理解为基础：1风险预防不同于风险预防原则。

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"In principle this is possible today, but the costs of creating and personalising the adverts would outweigh potential gains in terms of effectiveness, " says Adam Fulford, strategy and planning director at digital branding consultancy Rufus Leonard.

BBC: Digital product placement creates adverts out of thin air