确定一次完整的波动周期,可以从一个波峰到另一个波峰,也可以从一个波谷到另一个波谷,或者按周期中同样状态(高峰、低潮或整个周期)一些年的平均值到另一些年的平均值来衡量。
地磁活动是地球磁场的自然变化,其波动周期为11年。
Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.
讨论了生物量波动周期与多种环境因子的相关性。
The relationship between the fluctuation period of biomass and the various environmental factors was discussed.
人们可以自信地说,2008年是一个结构性转变,走向一个更大的波动周期回来。
One can confidently say that 2008 represents a structural break, moving back toward a period of greater volatility.
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