The World's Health Organization calls it a vicious cycle.

世界卫生组织称其为恶性环。

Physical exercises can stimulate the flow of blood.

运动能促进血液环。

STEP 2 Stretch to stimulate the nervous system and fight stress hormones. The resultant tightening of muscles will increase blood circulation compromised by high tension and inactivity. Merely moving has been shown to alter the brain's stress hormones.

做伸展运动，刺激神经系统，抵抗压力荷尔蒙。由此引发的肌肉紧张可以曾加受到紧张情绪和缺乏运动损害的血液环。仅仅运动就可以改变大脑的压力荷尔蒙水平。

In times of economic woe, when normal patterns of consumption and investment are frozen, prodigal government spending can sometimes be the only way to break the vicious circle of declining demand and shrinking employment.

在经济困难时期，常规的消费和投资模式会陷入僵局，慷慨的政府开支有时候可能是打破需求下滑、失业率上升这个恶性环的唯一途径。

Their expenditure created a virtuous economic cycle.

他们的开支创造了经济的良性环。

It's a vicious cycle, with seemingly no reprieve.

这是一个恶性环，似乎没有喘息的机会。

Once established, such a culture will kick start a cycle of positivity.

一旦这种社会和文化得以建成，这种文化就会开启一种良性环。

It's on an endless loop in the den.

屋里可都是环播放着的。

The elaborate economic rules and regulations was overseen by a bloated expensive bureaucracy locking the government into a vicious circle and marking the first step of western society into feudalism.

详尽的经济规则并未得到监督，因为官僚机构肿胀，政府陷入恶性环，标志着西方社会迈入封建社会的第一步。

Responsibility, dialogue, action and reporting are the key elements in a virtuous circle through which everyone benefits.

责任、对话、行动和汇报是良性环中的关键组成部分。这个良性环使大家都受益。

It's important to stretch because it keeps your blood circulation going.

拉伸很重要，因为它可以促进你的血液环。

No humans even touch them. That can create these vicious cycles, these self-reinforcing cycles.

人不去碰。这就可能产生恶性环，而且这些环会自我愈演愈烈。

Therefore, Loganair uses a network design referred to as a " milk run."

所以，洛根航空采用了一叫“环运输”的方式。

This creates a vaporized rock atmosphere on the planet like the Earth's water cycle.

这就在星球上形成了一种蒸发的岩石大气层，就像地球上的水环一样。

If you look out here to the south, you can see a circular ornamental Pond.

如果你从这里往南看，你会看到一个环的装饰性池塘。

Thanks to the cyanobacteria, a fascinating self-perpetuating circle came into being.

感谢蓝藻，一个迷人的自我永恒的环就此形成。

This vicious cycle is worth literally billions of dollars a year.

这一恶性环每年实际上价值几十亿美元。

So then it gets worse and worse and worse and you're in a vicious cycle.

然后情况变得越来越糟，越来越糟，你就进入了恶性环。

There may be a circular argument there.

这成环论证了。

Or it could loop around in a periodic way, like in some video games.

或者它可以进行周期性环，就像一些游戏一样。