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,
例句与用法
1.
In may 1911 the mayfly was found to lack sufficient lift to get airborne . 一九一一年五月，发现“蜉蝣号”飞艇的升力不足。
2.
Mayflies after hatching and then spending one to three years developing as naiads live only one day as adults 蜉蝣孵化出来后有1 3年作为稚虫生长，作为成虫只活一天。
3.
Mayflies ， after hatching and then ending one to three years developing as naiads ， live only one day as adults 蜉蝣孵化出来后有1 ? ? 3年作为稚虫生长，作为成虫只活一天。
4.
Mayflies , after hatching and then spending one to three years developing as naiads , live only one day as adults 蜉蝣孵化出来后有1 - - - 3年作为稚虫生长，作为成虫只活一天。
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