地球轨道的周期性变化会影响地球的气候。
Periodic changes in Earth's orbit could affect Earth's climate.
他经历了周期性的变化。
不过，也有人说，这只不过是一次周期性变化。
But there are those who say that this is just another cycle.
麻省理工学院神经系统科学家的新发现，脑波移频频率随着成为周期性的新任务变化
s that brain waves shift frequency as a new task becomes routine.
生猪产业的一个主要特征是产量和价格的周期性变化。
Cyclical fluctuation of production and price is the main characteristic of pig industry.
生猪产业的一个主要特征是产量和价格的周期性变化。
Cyclical fluctuation of production and price is the main characteristic of pig industry.
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