The black hole attack and the gray hole attack on the networks running under the AODV protocol are discussed.

重点讨论在AODV协议下的黑洞攻击和灰洞攻击，并根据攻击的特点，提出了一种利用虫洞原理防御的策略。

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Much of the time Roger looks either haunted or absent, not a black hole but a gray one.

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Bending down to change back into his shoes, Wolfowitz removed a slipper, revealing a large hole in the toe of one gray wool sock.

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