- secular change
- 变化: change; variety; transformat ...
- 周期性变化: cyclic variation; cyclical change; cyclical variation; cycling; periodic change; periodic variation; periodical change; periodical variation
- 非周期性变化: aperiodic variation; non periodic variation; nonperennial variation
- 周期性变化力: cyclic force
- 地磁周期性变化: period geomagnetic variation
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