Subnet mask is a 32-bit address, IP address used to shield part of the difference between a network address and host address.

子网掩码是一个32位地址，用于屏蔽ip地址的一部分以区别网络地址和主机地址。

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Alternatively you can invest in a quality eye mask to shield you from light while sleeping.

移除或遮住所有卧室内发光的电子设备。 或者也可以配置一个遮眼罩使你在睡眠使远离光线。

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The face shield was divided into three regions: orbital (O-region), Paraorbital (P-region) and Mask (M-region).

面罩由三个部分组成：遮盖眼睛、眼眶周围和面部区域。

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