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。
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。
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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