粘土沉积分布在古代的火山表面和坑坑洼洼的高原地区，其中一些显然是最近才由于侵蚀而暴露出来的。

The clay deposits are scattered all over, in ancient volcanic surfaces and heavily cratered highland regions, some of which have apparently been exposed by erosion only recently.

youdao

这条路坑坑洼洼的， 太差劲了。

The road is no good; it's rough and full of holes.

《新英汉大辞典》

塑料地毯遮住了坑坑洼洼的车道。

The plastic rug hides a bumpy driveway.

youdao

That's what you need for a phalanx, because to maintain the integrity of the hoplite line, you can't have bumps and grooves, and trees and rivers in the way; it will break things up.

而是方阵作战所必备的条件,为了维持重装步兵队列的完整性,就不能在坑坑洼洼,有树林有河流的地方布阵,这会把方阵打散

耶鲁公开课 - 古希腊历史简介课程节选