oceanic crust
noun [ C, usually singular ] geology specialized uk/ˌəʊ.ʃi ˈæn.ɪk ˈkrʌst/ us/ˌoʊ.ʃi ˈæn.ɪk ˈkrʌst/
大洋地壳
the part of the outer rocky layer of the earth that is under the oceans and is thinner than the layer under the land
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