Specific translation explanation:
May Day is International Labor Day, also known as May Day International Labor Day and International Demonstration Day. It is scheduled for May 1 day every year, which is a common festival for working people all over the world.
May Day International Labor Day originated from the workers' strike in Chicago, USA. On May 6th, Chicago workers went on strike to implement the eight-hour work system. After a hard and bloody struggle, they finally won. In order to commemorate this great workers' movement, 1889 announced at the Second International Founding Congress organized by Engels that May 1 day would be designated as International Labor Day every year.