And maybe someone would step on it and tumble over.

或许有人踩上去会摔倒。

youdao

It didn't just tumble over the edge, it actually flew, like a stunt in a James Bond film.

不只是翻滚下去，实际上是飞着的，詹姆斯·邦德电影里面的表演特技。

youdao

But I for one would not be in the least surprised to see rare earth prices tumble over the next few years.

FORBES: The Coming Glut of Rare Earths

In an industry which has seen costs rocket and the value of its product tumble over the last 18 months, producing at less of a loss is welcomed.

BBC: Richard Downes

The neatly set-out wine glasses tumble over onto the trestle table as the knot of camera crews and photographers seethe around the woman who would be President of France, Segolene Royal.

BBC: Segolene Royal