Like most aquatic insects, mayflies moult as they grow.
像大多数水生昆虫一样，蜉蝣在成长过程中换羽。
《柯林斯英汉双解大词典》
2
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。
3
They also found that the water became well aerated and that populations of important food-chain insects such as mayflies, stoneflies and caddisflies grew.