吃透英语课本，提升在校竞争力
n. 土墩；小丘；一堆
复数：mounds
an ancient burial mound
古代墓冢
The workers built a mound of soil.
工人们堆起了一堆土。
rubble mound
毛石堆；毛石基；堆石斜坡堤
mound breakwater
堆石防波堤；斜坡式防波堤
n.堆；高地；坟堆；护堤
height
pile
raise
altitude
rise
vt.堆起；筑堤
heap up
