We see a very particular type of feature in sedimentary rocks called 'hummocky cross-bedding'.
来自BBC
Surfaces may be fairly smooth or irregular, hummocky or ridged.
其表面也许是相当平滑或不规则, 成波形或背状.
The burying - ground is merely a huge waste of hummocky ( hilly ) earth , like a derelict ( deserted ) building - lot.
坟场只不过是一片 土丘 林立的荒野, 恰似一片已废弃不用的建筑场地.
The garden, twenty yards of unmown grass, hummocky as a field.
来自P. D. James