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1·The relationship between the non-equilibrium phenomena and rarefied gas dynamics is discussed.

讨论了非平衡现象与稀薄气体动力学的关系。

2·The flight of space vehicles, probes and shuttles set new demand on gas dynamics, including rarefied gas dynamics.

飞船、宇航探测器、航天飞机等复杂外形航天器给气体动力学，包括稀薄气体动力学提出了新的要求。

3·The flow characteristic of rarefied gas is very complicated in its dynamics problem.

稀薄气体的流动是一个复杂的稀薄气体动力学问题。