December(十二月)

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(dateEstablished WorldCustomsOrganization
    (DayFn 15
        (MonthFn December
            (YearFn 1950))))		 Government.kif 3055-3055 15 Day 是 世界海关组织 的成立 date
(equal WinterSeason
    (RecurrentTimeIntervalFn December February))		 Geography.kif 1667-1667 冬季 equal 从十二月到二月再次发生所需的时间
(subclass ChristmasDay
    (DayFn 25 December))		 Media.kif 337-337 ChristmasDay 是 25 day 的 subclass


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