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单词 protoxylem
释义

WordReference Random House Unabridged Dictionary of American English © 2024
pro•to•xy•lem  (prō′tə zīləm, -lem),USA pronunciation n. [Bot.]
  1. Botanythe part of the primary xylem that develops first, consisting of narrow, thin-walled cells.
  • proto- + xylem 1895–1900

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