...里拥有共同趋势(common trend)，如果他们的一阶差分存在共 同线性相关，那么它们的经济周期在短期里也拥有共同周期(common cycle)，这组 国家的经济周期具有同步性。
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当营养输入与毒素输入均为周期变化且有共同周期时讨论了种群的周期共存性。
When both the nutrient and toxicant inputs are periodic functions with the same period, the periodic coexistence of populations has been investigated.
考虑工件的“集合”如何以协作的方式共同地转换其生命周期也是重要的。
It is also important to consider how "collections" of artifacts jointly transition their lifecycles in some coordinated fashion.
新兴经济体的需求和注重特殊化学品的战略共同推动了经营业绩周期性好转，这促使收益率上升。
Profitability has been improved thanks to a cyclical upturn driven by demand from emerging economies and a strategy of placing greater emphasis on specialty chemicals.
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