坍陷

dì céng tān xiàn

地层坍陷

a stratum caved in

dì jī yǐ jīng tān xiàn le

地基已经坍陷了。

The foundations have sunk.

yán shí yīn wèi tān xiàn jìn rù āo cáo de zhōng xīn ér fā shēng zhě zhòu

岩石因为坍陷进入凹槽的中心而发生褶皱。

The rocks were folded by collapsing into the center of the trough.