Subject + 循环
The verb 循环 (xúnhuán) means 'to cycle,' 'to circulate,' or 'to loop.' It describes a process that repeats in a regular pattern. It can also function as a noun meaning 'cycle' or 'circulation,' as in 血液循环 (blood circulation) or 恶性循环 (vicious cycle).
血液在身体里不断地循环。
Xuèyè zài shēntǐ lǐ bùduàn de xúnhuán.
Blood circulates continuously throughout the body.
这首歌一直在循环播放。
Zhè shǒu gē yìzhí zài xúnhuán bōfàng.
This song has been playing on repeat.
我们要打破这种恶性循环。
Wǒmen yào dǎpò zhè zhǒng èxìng xúnhuán.
We need to break this vicious cycle.