复数：flag days
1.〈英〉(卖旗募捐的)旗日
2.〈美〉国旗制定纪念日(六月十四日)
1.in the U.K., a day when people collect money in the street for charity
2.in the U.S., the day of June 14th when people celebrate the day in 1777 when a flag was chosen for the country
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