The periodical wave in economic phenomenon influences the enterprises' business and management.
经济现象中的周期波动影响企业的经营管理。
Phase is a kind of important wave parameter of periodical signal.
相位是周期信号的一种重要的波形参数。
Physically, at a special critical wave speed the flow may have a naturally periodical separated-reattached pattern, with each wave trough capturing a stable vortex ring.
物理上看，在一个特定的临界行波速下会形成自发的周期性分离再附流，每个波谷的分离区捕获一个稳定的涡环。
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