Such vicious cycles have destroyed the world many times before.

这种恶性循环以前已经毁灭了世界很多次了。

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Sometimes we can get into vicious cycles if we rely on food to help us through some of those emotions and some of those psychological issues that we're dealing with.

有时候如果我们依赖食物来帮助我们度过情绪危机和那些我们所面对的精神问题的话，我们会进入恶性循环。

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Coffee later in the day also disrupts our sleep cycles, which continues the vicious cycle of waking up feeling unrested and needing that cup of joe to wake yourself up.

在晚上，咖啡也会扰乱我们的睡眠周期，持续着睡不着无法休息好，然后又只能用咖啡提神的恶性循环。

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Illiteracy locks communities into vicious cycles of poverty that lay the conditions for violence and strife.

UNESCO: EDUCATION

Alhajji sees a number of vicious cycles that will support continued strength in oil prices for the foreseeable future.

FORBES: Could We See A Summer Oil Shortage? This Economist Says Yes.

Like all vicious cycles, the relationship between the declining fortunes of news outlets and the shrinking of their audiences is a difficult one to untangle, a chicken-and-egg problem.

FORBES: Pew Study: Americans Abandoning News Outlets, Citing Lower Quality