festival → feast、festoon

festival n. 节日
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词根：fest 快乐，狂欢
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feast [fiːst] n. 盛宴
例：a feast of music 一场音乐的盛宴
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festoon [feˈstuːn] n.&v. 张灯结彩，装点
例：The hall was festooned with Christmas lights and holly. 大厅里悬挂着圣诞彩灯和冬青枝。（剑桥词典）