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1. Oxford American Dictionary

   asthenosphere

   • IPA[asˈTHenəˌsfir]

   美式

   • n.
     the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.

   • noun: asthenosphere

2. • 更多解釋

   asthenosphere

   • IPA[əsˈθɛnəsfɪə]

   英式

   • n.
     the upper layer of the earth's mantle, below the lithosphere, in which there is relatively ...

   Oxford Dictionary