一个定态表明有一个X可能值的展宽。
模型化是处理非定态操作的主要工具。
Mideling is the major tool to deal with unsteady-state operations.
当你把钢琴弹奏安全地依附于一定态的身体，你就有了这样一个稳定得多的参考平台。
When attached securely to a steady body, you have a much more stable reference platform.
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。
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。
However only steady and mean flow state have been studied for a long period of time.
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