We might wonder what causes it.

我们会想这个的原因是什么。

youdao

It's feedback. What causes it is simple.

导致反馈杂音是容易理解的。

youdao

But nobody has truly understood what causes it.

但是没有人真正理解问题所在。

youdao

Scientists don't know what causes it, but besides a genetic predisposition, they are now focusing on environmental exposure, or a combination of the two.

VOA: standard.2010.08.09

We might wonder what causes it.

我们会想这个的原因是什么。

耶鲁公开课 - 死亡课程节选

And he claimed it causes an unpleasant emotional state, what he described as "dissonance."

他认为这会让人进入一种情绪不安的状态，他称之为“失调”

耶鲁公开课 - 心理学导论课程节选

There are a lot of theories -- nobody really knows what causes it.

CNN: Smoking quadruples risk for vision-stealing eye disease

For the better part of a century, wood scientists have been beating up on each other's explanations of what causes it.

NPR: Excerpt: 'A Splintered History Of Wood'

What causes it: Inflammation of the plantar fascia, a thick band of tissue that runs along the bottom of your foot from the heel to the toes.

CNN: Why your feet hurt