美 [ˈvɪʃəs ˈsaɪkl]
恶性循环：恶性循环是一种通过反馈循环而加强自身的复杂事件链，其结果是有害的。它是一个没有趋向平衡的系统（社会、经济、生态等），至少在短期内是如此。循环的每一次迭代都会加强上一次迭代，这是正反馈的一个例子。恶性循环会沿着其动力的方向继续，直到外部因素介入打破循环。经济学中一个著名的恶性循环例子是恶性通货膨胀。
one trouble leads to another that aggravates the first
同义词： vicious circle
... 在经济上，一如其他行为，都有著事物间的辩证关系，所谓的「良性循环（Virtuous cycle）翻转为「恶性循环（Vicious Cycle）即是其一。而本书所探讨的即是这两种循环接轨后所造成的通货紧缩及经济衰退。
... 表演者: Lynyrd Skynyrd 唱片名: Vicious Cycle 出版者: Sanctuary Records ...
恶性循环
We need to break the vicious cycle of violence and counterviolence.
我们需要结束暴力和反暴力的恶性循环。
Perlow calls this vicious cycle the "cycle of responsiveness": Once bosses and colleagues experience an employee's increased responsiveness, they increase their demands on the employee's time.
佩洛将这种恶性循环称为“响应周期”：一旦老板和同事感受到员工的响应性增强，就会要求该员工工作更长时间。
And so the vicious cycle begins.
就这样，恶性循环又开始了。
And,this is the mechanism that leads into this vicious cycle where you suddenly do not see or do not perceive to have any alternative."
VOA : standard.2009.08.21
And what we know is that very often we enter a downward spiral, a vicious cycle when we go into this narrow and constrict mode.
我们知道经常会进入下行螺旋，一个恶性循环，当我们进入狭窄收紧的模式。
幸福课课程节选 : 哈佛公开课
That's when I have difficulty getting out of this downward, vicious cycle.
那时我将很难脱离这种下行，恶性的循环。
幸福课课程节选 : 哈佛公开课
The International Organization for Migration says most of Iraq's more than 1.5 million internally displaced people are caught in a vicious cycle of despair.
VOA : standard.2009.10.04
Galmudug regional government Minister of Planning Omar Mohamud warns that not implementing a long-term solution to the water problem will fuel the vicious cycle of droughts, hunger,and violence and keep the Somali people in the iron grip of poverty.
VOA : standard.2009.10.06
That makes it harder for entrepreneurs seeking funding to land meetings, and the vicious cycle continues.
FORBES: Chicago's SpotHero Raises 2.5mm to Bring Sanity to Urban Parking
This vicious cycle of patronage and corruption lies at the root of Turkey's financial ills.
ECONOMIST: Fresh IMF money may save the economy, at a high social cost
It is possible to tone down this vicious cycle and make it less dysfunctional.