五一节英文介绍如下：
International Labor Day, also known as May Day or May Day, is a national holiday in over 80 countries around the world. It is scheduled on May 1st every year. It is a holiday shared by working people all over the world.
翻译：国际劳动节又称“五一国际劳动节”“国际示威游行日”（英语：International Workers' Day，May Day），是世界上80多个国家的全国性节日。定在每年的五月一日。它是全世界劳动人民共同拥有的节日。
In July 1889, the Second International, led by Engels, held a congress in Paris. The meeting passed a resolution stipulating that international workers would hold a parade on May 1, 1890, and decided to designate May 1 as International Labor Day.
The State Council of the Central People's Government made a decision in December 1949 to designate May 1st as Labor Day. After 1989, the State Council basically commended Model worker and exemplary individual every five years, with about 3000 people each time.
翻译：1889年7月，由恩格斯领导的第二国际在巴黎举行代表大会。会议通过决议，规定1890年5月1日国际劳动者举行游行，并决定把5月1日这一天定为国际劳动节。中央人民政府政务院于1949年12月作出决定，将5月1日确定为劳动节。1989年后，国务院基本上每5年表彰一次全国劳动模范和先进工作者，每次表彰3000人左右。