If, however, the pair appears on the edge of an event horizon, either particle or hole may wander across the horizon, never to return.

然而，如果两者出现在视界的边缘，粒子或者黑洞都可能穿过视界再也不会来。

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Numerically studies the concentration distribution of biological particle similar as SARS virus particle in HVAC system with return air.

采用数值计算方法，对带有回风的空调系统中类似SARS病毒颗粒的生物颗粒浓度的分布规律进行了模拟分析。

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Torres created the formula for the spray with the help of Paul Luckham, a professor of particle technology at Imperial, offering him a 20% stake in Fabrican Ltd (established in 2003) in return for working with him on the project one day a week.

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