| 单词 | polycrase | 
| 释义 | polycrasenoun  poly·crase   -āz    plural -s     : a mineral (Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6 consisting of a columbate and titanate of the metals of the yttrium group that is isomorphous with euxenite (hardness 5–6, specific gravity 5)   | 
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