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