Explain what is the definition of 'transition metal'?
请解释过渡金属的定义是甚么。
The catalyst may be provided on a support material, such as a transition metal.
所述催化剂可提供在载体材料上，例如是过渡金属。
The transition metal materials have good performance, such as long luminescent life and single color.
过渡金属配合物发光材料的发光寿命长、单色性好。
The transition metal materials have good performance, such as long luminescent life and single color.
过渡金属配合物发光材料的发光寿命长、单色性好。
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