a hard gray lustrous metallic element that is highly corrosion-resistant; occurs in niobite and fergusonite and tantalite.
一种坚硬有光色金属元素,抗腐蚀性极,见于铌、褐钇铌和中。
a hard gray lustrous metallic element that is highly corrosion-resistant; occurs in niobite and fergusonite and tantalite.
一种坚硬有光色金属元素,抗腐蚀性极,见于铌、褐钇铌和中。
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