And that's where the theory falls down.

这就是该理论的不足之处。

《牛津词典》

Success is not something that falls down from the sky.

成功不是天上掉下来的馅饼。

youdao

The balloon moves back down from space until it falls down in the sea.

气球从太空返回，直到落在海里。

youdao

Here they can see Waimoku Falls where water drops one hundred twenty meters down the face of a mountain.

VOA: special.2010.09.08

And if you're not paying attention to that, the business doesn't succeed, it just falls down.

如果不考虑到这些的话，我们的企业便不会成功。

斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选

everyone falls down, you just got to get back up.

人人都摔倒，站起来就好。

不要放弃 - SpeakingMax英语口语达人

This stage then falls down into a level of integration back into the music.

FORBES: Working In The Flow Challenges Our Collaborative and Leadership Skills

Texas falls down in a number of categories, most of them to do with education.

ECONOMIST: Lone Star rising

In the show, his character falls down a set of stairs three times.

WSJ: Broadway Goes Uptown for Tony Awards