life cycles
英
美
- cycles n.循环；周期；自行车；摩托车v.骑自行车；(使)轮转；(使)循环
- life n.一生；生命；生活；人生
名词 life cycle:
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a series of stages through which an organism passes between recurrences of a primary stage
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the course of developmental changes in an organism from fertilized zygote to maturity when another zygote can be produced
