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蜉蝣昆虫,体软弱,触角短,有翅两对。幼虫生活在水中,需一至三年或五至六年以上才能成熟;成虫寿命很短,只有数小时至一周左右,一般朝生暮死。
Insects have a weak body, short antennae, and two pairs of wings. Larvae live in water and require one to three years or five to six years to mature; adults have a short lifespan of only a few hours to a week or so and generally die of sudden life.