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  1. upper-crust

    • KK[ˋʌpɚ͵krʌst]
    • DJ[ˋʌpəkrʌst]

    美式

    • adj.
      上流社會的;上流階級的;有上流社會之性質的
  2. 知識+

    • 可否幫我檢查這兩段英文的文法或用字

      ...earthstructure. The Earth's outer silicate solid crust the highly viscousmantle, much less viscous than the mantle and core..., on Earth can be divided into thecrust upper mantle, lower mantle, outer core and the kernel. ...