fusion [ˈfju:ʒn]

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n.溶化；熔解；熔化状态，熔和；熔接

when two or more things join or are combined

Brass is formed by the fusion of copper and zinc. 黄铜是通过铜和锌的熔合而成的。
This alloy is formed by the fusion of two types of metal. 这种合金是用两种金属熔合而成的。