+7 = 15 

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  1. (zirconium,Zr)​化學元素原子序40。金屬元素銀灰色光澤質地堅硬 延展性鹼性腐蝕腐蝕結構材料製造外科器材

zirconium (chemistry)​
zirconium
Zirkonium (Element 40, Zr)​ (S, Chem)​