...三次对称轴 trigonal axis ; axis of trigonal symmetry ; triad axis 六次对称轴 hexagonal axis ; axis of hexagonal symmetry ; hexad axis 四次对称轴 axis of tetragonal symmetry ; tetrad-axis...
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... 三叉角石 Trifarcatoceras 三次对称轴 axis of trigonal symmetry 三次对称轴 triadaxis ...
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三次对称轴线 three-fold symmetry axis
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