But the report also points out there's some environmental harm done by filtering spam, too.

然而，报告同时指出过滤垃圾邮件也会造成环境危害。

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He points out that a similar spin-filtering of photons due to Bragg diffraction has been seen in cholesteric liquid crystals, which also have a helical structure.

他指出，由于布拉格衍射效应，在同样具有螺旋结构的胆甾相液晶中也观察到了类似的光子自旋滤波。

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MAC address filtering and base station discovery policies that prevent the deployment of unauthorized access points and other wireless devices can be enforced at the final layer.

而在最后一层则可执行那些用来防止未经授权的访问点以及其它无线设备配置的MAC地址过滤和基站发现策略。

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