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单词 perlite
释义 perlite
 —perlitic /perr lit"ik/,  adj.  
 /perr"luyt/, n. Petrog.
 a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium.
 Also, pearlite.
 [1825-35; < F; see PEARL1, -ITE1]
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