(subclass USThanksgivingDay USHoliday) | Media.kif 619-619 | USThanksgivingDay 是 USHoliday 的 subclass |
(subclass USThanksgivingDay MoveableHoliday) | Media.kif 620-620 | USThanksgivingDay 是 可动的假期 的 subclass |
(subclass USThanksgivingDay Thursday) | Media.kif 621-621 | USThanksgivingDay 是 星期四 的 subclass |