International Workers' Day is a celebration of labour and the working classes that is promoted by the international labour movement and occurs on May 1 every year.
国际劳动节是劳工和工人阶级的节日。它的是由国际工人运动推动产生的，并且被定于每年的5月1日。
May 1 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 that occurred on May 4, 1886
5月1日这个日子是由第二国际的为纪念1886年5月4日发生在芝加哥的“干草市场事件”而确定的。
Still other countries celebrate a Labour Day unrelated to International Workers' Day and on other dates significant to the labour movement in that country, such as the Labor Day in the United States which is on the first Monday of September.
仍然有国家不在5月1日庆祝劳动节，而选择在别的日子来庆祝、纪念本国的工人运动。比如，美国的劳动节是定于每年9月的第一个星期一。
