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N the first winged stage of the mayfly, with dull opaque wings, known to anglers as a dun, before it metamorphoses into the shiny gauzy imago or spinner 亚成虫
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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