mayflies
n.
蜉蝣类，飞蝼蛄( mayfly的名词复数 );
例句:
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Mayflies...the only insect group to have a winged larval stage.
来自BBC Wildlife
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The life cycle of mayflies consists of four stages: egg, nymph, subimago, and imago.
蜉蝣的生命周期由四个阶段组成: 卵, 蛹,亚成虫, 成虫.
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Mayflies in streams where trout were released now forage at night to avoid the fast-swimming predators.
来自SA
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Matt Hamilton has uncovered the secret life of the mayflies that inhabit the Itchen Navigation.
来自BBC