cycle
生命周期
the series of changes in the life of an organism, including reproduction
生物体生命中的一系列变化。
自然循环
a cycle that occurs in nature, such as the seasons or life and death
自然界中发生的循环，如季节或生死
恶性循环
a negative chain of events that repeats itself, where each problem creates another one
一种自我重复的负面事件链，其中每个问题都会引发另一个问题
睡眠周期
the progression of different stages of sleep that repeats throughout the night
整夜重复的不同睡眠阶段的进展
经济周期
the periodic fluctuation in economic activity, including expansion and contraction
经济活动的周期性波动，包括扩张和收缩
水循环
the natural process of water moving between the Earth's surface and the atmosphere
水在地球表面和大气之间移动的自然过程
商业周期
the periodic fluctuation in economic activity, including expansion and contraction
经济活动的周期性波动，包括扩张和收缩
碳循环
the natural process of carbon being exchanged among the atmosphere, oceans, soil, plants, and animals
碳在大气、海洋、土壤、植物和动物之间交换的自然过程
新闻周期
the period of time during which a particular news story is reported and discussed
特定新闻报道和讨论的时期
月度周期
a cycle that repeats every month, often referring to the menstrual cycle
每月重复的周期，常指月经周期
开发周期
the process of creating or improving a product, from conception to release
创建或改进产品的过程，从构思到发布
生殖周期
the cycle of physiological changes related to reproduction in living organisms
生物体为繁殖而经历的生理变化。
良性循环
a positive chain of events that repeats itself, where each good result reinforces the next
一系列事件形成的链条，其中一个积极事件引发另一个，从而带来持续的改善。
繁荣与萧条周期
a cycle of economic expansion followed by a sudden collapse
经济扩张后突然崩溃的周期
摩托车
a two-wheeled vehicle powered by a motor, more commonly known as a motorcycle
一种由马达驱动的两轮车，通常称为motorcycle
循环（自我）重复
used to indicate that a series of events happens again in the same order
用于表示一系列事件以相同的顺序再次发生
循环继续
used to indicate that a series of repeating events is still in progress
用于表示一系列重复事件仍在进行中
循环再次开始
used to indicate that a series of repeating events is starting over
用于表示一系列重复事件重新开始
循环的一部分（某事的）
being one stage in a larger, repeating process
作为一个更大的重复过程中的一个阶段
贫困的循环
a situation where poor families become trapped in poverty for generations
贫困家庭世世代代陷入贫困的境地
暴力的循环
a repeating pattern where acts of violence are followed by more violence
暴力行为之后是更多暴力的重复模式
在一个/这个周期中
used to describe being at a certain stage of a process or sequence
用于描述处于一个过程或序列的某个阶段
打破一个循环
to stop a repeating pattern of events, especially a negative one
停止一个重复的事件模式，特别是负面的模式
使循环永久化
to cause a repeating pattern, especially a negative one, to continue indefinitely
导致一个重复的模式，特别是负面的模式，无限期地持续下去