But the threat of terrorism, according to former Yemeni prime minister Abdul Karim al-Iryani, is equally part of the downward economic spiral causing anger on the streets of Sana'a.

VOA: standard.2010.04.20

It's the positive emotion that can take us out from this downward spiral to this upward spiral.

积极情绪,能把我们带离这个下行螺旋进入这个上行螺旋。

哈佛公开课 - 幸福课课程节选

They used to pay out typically like 80% of their earnings but it's been gradually going downward and now it's down to like 40%.

过去他们将收益的80%作为股利,但现在正慢慢减少,目前降到了40%

耶鲁公开课 - 金融市场课程节选

And the challenge is to combine "the permission to be human" to experience the emotion to go through the motion and yet not to enter the downward spiral where six months later, after small incident, I'm still in that rot.

困难在于将之与准许为人相结合“,去体会情绪，实现转移,但不会进入下行螺旋，在发生小小意外六个月后，仍心情低落。

哈佛公开课 - 幸福课课程节选

You can see that if a was equal to g, your downward acceleration is that of gravity, namely the cable has snapped in the elevator, Then you don't feel any weight.

你会发现如果 a 等于 g,你下降的加速度就是重力加速度,也就是电梯的绳索断了,那时你会完全失重

耶鲁公开课 - 基础物理课程节选