• 生活周期〔循环〕

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.（生物的）生活史，生活周期
Thelife cycle of an animal or plant is the series of changes and developments that it passes through from the beginning of its life until its death.

e.g. The dormant period is another stage in thelifecycle of the plant.
休眠期是这种植物生活史中的另一个阶段。

2.（想法、产品、组织等的）存在周期
Thelife cycle of something such as an idea, product, or organization is the series of developments that take place in it from its beginning until the end of its usefulness.

e.g. ...the stages of the familial and economiclifecycle...
家庭及经济生活周期的各个阶段
e.g. Each new product would have a relatively longlifecycle.
每种新产品都将会有相对较长的生命周期。

1. 寿命周期：铝制罐已支配世界罐头市场长达35 年以上的时间,目前从商品货架寿命周期(LifeCycle)来看它已经有进入市场衰退期的迹象. 以前,大部分积累了许多开发经验和研究经费的企业大多数投入了DWI 饮料罐的生产. 但是,

2. 生活周期：植物的生活史与世代交替植物从生长发育的某一阶段开始,经一系列生长发育生殖过程,产生下一代后又重现了该阶段的现象称为生活周期(lifecycle)或生活史(life history).

3. life cycle

3. 生活史：在有阳光的条件下,一些含色素:叶绿素(chlorophyll)、叶黄素(xanthophyll)等的原生动物可利用二氧化碳和水进行光合作用合成碳水化合物,如植物性鞭毛虫,但种类和数量都很少;四、原生动物的生殖(reproduction)和生活史(lifecycle).

1. Most accounting entities are assumed to have an indefinite life.
   大多数会计主体被假设有一个无限定的生存期。
2. Pleural effussion of lung cancer is a common complication in late lung cancer, and it acutely affects patients' quality of life and life span.
   摘要肺癌胸腔积液是肺癌晚期的常见并发症，严重地影响患者的生活质量和生存期。
3. The bug attains different states in the life cycle.
   缺陷在其生命周期中会处于许多不同的状态。
4. Aging is the neglected stepchild of the human life cycle.
   衰老过程是人类生命周期中被忽视的非亲生儿。