E-mail filtering is becoming a research hotspot in network information security area.
电子邮件过滤是网络信息安全研究的热点。
The device has large filtering area, simple structure, and significant energy saving effect.
本装置过滤面积大，结构简单，节能显著。
The device has large filtering area, simple structure, and significant energy saving effect.
本装置过滤面积大，结构简单，节能显著。
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