名詞 life cycle:

1. a series of stages through which an organism passes between recurrences of a primary stage
2. the course of developmental changes in an organism from fertilized zygote to maturity when another zygote can be produced

1. A plant that completes its entire life cycle in a single growing season.
   一年生植物全部生命周期為一個生長季節(jié)的
2. Plankton that remains free-swimming through all stages of its life cycle.
   終生浮游生物一種在其生命的所有階段可自由游動的浮游生物