夜现周期性 nocturnal periodicity
重现周期 recurrence period ; [地震] return period
微丝蚴的夜现周期性 nocturnal periodicity
复现周期 Interval recurrence
地震重现周期 return period of earthquake
现金流量周期 Cash to Cash Cycle
现金周期 the cash cycle ; cash conversion Cycle
光周期现象 photoperiodicity ; [农学] photoperiodism
现金循环周期比率 Cashcycleratios ; cash cycle ratios
这意味着第25周期的喷流本该在2008年或2009年出现，但它至今还未出现。
That means the flow for Cycle 25 should have appeared in 2008or 2009, but it has not shown up yet.
生物学家Leonard Hayflick和Paul Moorhead于1961年发现这个细胞老化减缓的现象，他们认为这是正常细胞生长周期中的一个普通环节。
This slowdown, first identified in 1961 by biologists Leonard Hayflick and Paul Moorhead, is a normal part of cellular life cycles.
倒转过程不是真正具有像在太阳上那样的周期性，太阳磁场每11年出现倒转。
The reversal process is not literally periodic as it is on the sun, whose magnetic field reverses every 11 years.
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