drifting maxwellian gas distribution 漂移麦克斯韦分布
Gas emission in opening drifting may be divided into three types.
井巷掘进中，瓦斯不断涌出，其型式分缓变、突变、突增渐缓三种。
Ultimately the natal gas and dust in the region will be dispersed, the stars drifting apart as the loose cluster orbits the center of the Galaxy.
最终，这个区域里的新生气体和尘埃会慢慢消散，随着这个松散的星团围绕星系中央旋转，这些恒星也会随波逐流、各奔东西。
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