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the estrous cycle
潜伏期.
過去時制.
a time-transaction
時間が経過すること
the growing season for corn
hawksbills
the shooting season―the open season
a cycle
term of study―the school course
hour-arrangement
始新世.
the Eocene epoch
the imperative mood
潜伏期.
the gestation period
火ばし
a royal road to anything