dune [dju:n]

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n.(由风吹积而成的)沙丘

a hill of sand near a beach or in a desert

The sand massed to form a dune. 沙积集起来成了沙丘。
Cute Jim sat on the dune eating a prune in June. 可爱的吉姆在六月天坐在沙丘上吃着话梅。