霍金提出：大质量天体的坍缩不足以形成黑洞，而形成比典型中子星有较小的半径和较大的密度的天体叫作灰洞。
我们在奥斯陆机场等了好几个小时，知道飞机找到了几个灰洞才飞过去。
We were stranded at Heathrow Airport for hours until the airline found some ash hole to fly through.
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。
The black hole attack and the gray hole attack on the networks running under the AODV protocol are discussed.
外喷的气体将大量的灰尘和火山灰带入空中。数以吨计的火山灰，在地球的这个洞的周围，形成一个锥体。
The out-rushing gases carry up into the air huge amounts of dust and ashes. The tons of ashes form a cone around the hole in the earth.
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