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詞語:sphen
sphen的解釋
sphenn. 榍石
sphen的意思
sphen 榍石;
sphen的參考例句
1.It is difficult to contended quality require on common machine tool for more group high accurate concave sphen-cal surface. 對多組較高精度要求的凹球面,在普通機床上加工質量難滿足圖紙要求的問題。