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  1. upper crust

    • ph.
    • 釋義


    • 1. 【口】上流社會 belong to the upper crust 屬於上流社會
    • 2. 麵包表層的皮
  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. ...