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a cycle
the prenatal period
過去時制.
the estrous cycle
the neonatal period
原生代.
the Proterozoic era
the beginning period of something
潜伏期.
月経周期.
the menstrual cycle
a cycle
the prenatal period
過去時制.
原生代.
the Proterozoic era
the neonatal period
the estrous cycle
潜伏期.