However only steady and mean flow state have been studied for a long period of time.
在很长的一段时间内，人们对上述流态的了解仅限于定常的或时间平均的流态。
Steady-state heat flow is comparable to the flow of an incompressible fluid.
稳态热流和不可压缩流体的流动可相比拟。
Steady-state heat flow is comparable to the flow of an incompressible fluid.
稳态热流和不可压缩流体的流动可相比拟。
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