- periodically variable quantity
- 周期性: periodicity; cyclicity
- 变量: variable; variable quantity; ...
- 周期性变动: cycle variation; cyclic movement; cyclic variation; cyclical movement; cyclical variation; periodic fluctuation
- 周期性变化: cyclic variation; cyclical change; cyclical variation; cycling; periodic change; periodic variation; periodical change; periodical variation
- 周期性变迁: periodic succession
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