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ark shell

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Ark shell \Ark" shell`\ (Zo["o]l.)
   A marine bivalve shell belonging to the genus {Arca} and its
   allies.

資料來源 : WordNet®

ark shell
     n : marine bivalve mollusk having a heavy toothed shell with a
         deep boat-like inner surface
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