a day when Catholics must attend Mass and refrain from servile work, and Episcopalians must take Communion
例句与用法
1.
In the catholic church , the feast of the immaculate conception on 8 december is generally a holy day of obligation , and a public holiday in countries where catholicism is predominant 在天主教会， 12月8日的无沾成胎说庆祝是一个义务的宗教节日，在天主教国家里是一个公众节日。
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