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guide fossils造句

"guide fossils"是什么意思   

例句與造句

  1. Guided fossil-hunting treks allow ordinary folks to become amateur paleontologists
  2. "Phyllograptus " species are excellent index fossils or guide fossils for identifying Ordovician rocks.
  3. Index fossils ( also known as guide fossils, indicator fossils or zone fossils ) are fossils used to define and identify geologic periods ( or faunal stages ).
  4. Fossil fans can dig it : See what you can dig up when you join this hands-on, guided fossil expedition through Old Topanga Canyon at 9 a . m . Saturday.
  5. It's difficult to find guide fossils in a sentence. 用guide fossils造句挺難的

相鄰詞匯

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