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单词 Orthograptus
释义 Orthograptus
基本例句
直笔石属¹⁰⁰
The Longmaxi formation of Lower Silurian is ten metres in thickness,containing three graptolite zones:Glyptograptus persculptus,Parakidograptus acuminatus andOrthograptusvosiculosus.下志留统龙马溪组厚10m;含Glyptograptus persculptus;Parakidograptus acuminatus及Orthograptusvosiculosus三个笔石带.
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