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biology 生物 the series of forms into which a living thing changes as it develops 生命周期，生活周期（生物发展过程的系列变形） the life cycle of the butterfly 蝴蝶的生命周期
the period of time during which something, for example a product, is developed and used 生命周期，寿命（产品等从开发到使用完毕的一段时间）