slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days
同义词：dayfly, shadfly
mayfly详细解释
may.fly n.（名词）Any of various fragile winged insects of the order Ephemeroptera that develop from aquatic nymphs and live in the adult stage no longer than a few days.Also called dayfly ,shadfly 蜉蝣：蜉蝣纲的各种有纤细翅膀的昆虫，由水生的蛹发育而成，成年期仅存活几天也作 dayfly,shadfly
