...变化，是植物长期适应环境的表现，植物生长的周期性具体表现有昼夜周期性(daily periodicity)和季节周期性(seasonal periodicity)。
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植物生长的季节周期性 seasonal periodicity growth
生长的季节周期性 seasonal periodicity of growth
季节性的、周期性的 seasonal
目的：揭示脑出血发病时间的季节周期性和日变化规律。
Objective: To explore the seasonal and circadian variation in the timing of cerebral hemorrhage.
水位随季节周期性消落，将导致水体相和沉积物相中的总汞浓度按枯、丰、平顺序依次递减。
As the result of seasonal fluctuation of water, the total Hg concentration of water and sediment would be degressive in sequence of low water, flush time and ordinary level.
有一些流量趋势是周期性的，比如，工作日的流量比周末的流量大，或者是夏天月份的流量比其他季节流量低。
Some traffic trends are cyclical, e.g. there is more traffic during the week than the weekend or the summer months are slower than non-summer months.
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