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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)