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1·This paper deals with the statistical properties about two dimensional photon gas and free electron gas.

讨论了二维光子气体和自由电子气体的统计性质。

2·The concept of the radiation pressure and the physical essence of it are presented based on the photon gas.

从粒子的观点介绍了辐射压的概念，阐明了辐射压的物理实质，给出了计算辐射压的一般公。

3·Because here what we have is some atom that we're studying, in the case, it's going to be a gas, and we hit it with a photon that has some incident energy.

因为这里我们要研究的是一些原子，在这种情况下，一般是气态的，然后我们令一个，具有一定初始能量的光子打上去。