周期 zhōuqī period
period; cycle
How to remember 周期: 周 week + 期 a period of time = period.
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How it is used
- A recurring cycle or period - 生命周期 (shēngmìng zhōuqī) life cycle, 经济周期 economic cycle.
- Scientific/technical: a repeating interval. Contrast 时期 (shíqī), which is a one-off era or phase, not a repeating loop.