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duna form.
environ.	沙丘 松散的、被风吹动的粒状物(通常是沙子，有时是火山灰)所形成的低墩、山脊、沙洲或小丘，可能是光秃秃或覆盖着植被，能移动位置但总保留着它的形状特征。

duna: 2 phrases in 1 subject

Environment

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