在采用分离求解器时，周期性流动计算的设置面板为周期性条件（Periodicity Conditions）面板： Define->Periodic Conditions..
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该模型由描述系统振动的双曲型偏微分方程组及相应的边界条件和周期性条件组成。
This model consists the hyperbolic partial differential equations, boundary conditions and cyclical conditions of the system.
然而，当在实验室的恒定条件下观察硅藻时，它们仍然表现出周期性的行为，继续按计划挖掘几个星期。
However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks.
他们探究了“周期性”和“结构性”失业之间的渐变过程和两者产生、转换的条件。
They explored the gradations between "cyclical" and "structural" unemployment, and the conditions under which one or the other arises or gives way to the other.
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