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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The gray circle at the center of each image is the "pole hole," north of which satellite sensors have historically been unable to collect data.

每幅图中心位置的灰色圆圈是“极点”，卫星从来都无法在极点以北收集数据。

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At last a gray rat came out of the hole.

终于，一只灰色的小老鼠从洞里钻了出来。

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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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