经济周期 commercial circle; commercial cycle; economic circle; business cycle ; the economic cycle ; business cycle ; [经] economic cycle
生命周期 Life cycle ; Product Life Cycle ; SDLC
细胞周期 [细胞] Cell Cycle
生产周期 production cycle ; [工经] production cycle ; Cycle Time
周期 [科技] Cycle ; [科技] Period ; Cyclicality
元素周期表 periodic table ; [化学] periodic table of elements ; Periodic Table of Chemical Elem ; [化] periodic table of (chemical) ele ments
周期性 [数] periodicity ; cyclicality ; cyclicity
商业周期 commercial cycle; business cycle ; [贸易] business cycle
自转周期 rotational period ; a period of rotation
周期素 Cyclin
这一周期上次见底远在1930年代。
排名的计算以四年为一周期，即便是友谊赛，对积分的影响也微乎其微。
Calculations are made on the basis of results over a four-year period and even friendlies have a minor place in the formula.
还有一个变量即月光亮度，随着月亮29.5天一周期的盈亏，月亮的亮度会发生变化。
An additional variable is that the moon can have varying degrees of intensity, depending where it is during its 29.5 day cycle of waxing and waning.
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