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Relation: subclass

TimeInterval70这是一个时段。注: TimeInterval 在通用时间轴上 皆有范围和位置;另外 TimeInterval 是没有间隙的,即这个类别只含凸时间间隔。^
    Year1这是所有日历 YearClass^
        LeapYear.这是所有闰年的 Class。这些年份当中,要不是(i.)能被4 却不能被100整除的,或是 (ii.)能被400整除的(后者是为世纪闰年)。^

Relation: Term:

Levels "above": Levels "below": Total term limit: Show instances:
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