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International Workers' Day或者May Day,日常中常见的是May Day。
例句:过去在五一劳动节这天,数十万人常常乘坐大巴到东柏林游行。 On May Day hundreds of thousands used to be bussed in to parade through East Berlin
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In the late 19th century, May Day was chosen as the date for International Workers' Day by the Socialists and Communists of the Second International to commemorate the Haymarket affair in Chicago.[2] International Workers' Day may also be referred to as "May Day", but it is a different celebration from the traditional May Day.