一般而言，该问题归结为模大素数的二次剩余问题，但这种归结不能用于最优扩域OEF。

Generally, this problem is reduced to quadratic residue problem of modulo a big prime number. But this reduction is not applicable to Optimal Extension Fields (OEF).

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在对目前已有证书状态发布方案分析的基础上，本文提出基于二次剩余难解问题的证书撤销状态发布方案。

Following the analysis of the existing certificate revocation schemes, we propose a new certificate revocation scheme based the difficulty of resolving the Quadratic Residues problem.

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剩余污泥一直是中、小型污水生化法处理设施的遗留问题，处置不当，易造成二次污染。

Residual sludge from the small scale wastewater treatment plant is always a problem remained in biological wastewater treatment, it may cause secondary pollution if not disposed well.

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