Toreutics?definition is - the art or process of working in metal especially by embossing or chasing.
金属浮雕的定义是在金属上加工的工艺或过程，特别是通过压花或雕刻。
2
Explain what is the definition of 'transition metal'?
请解释过渡金属的定义是甚么。
3
A new definition and measurement method of damage is put forward, the damage critical value of metal is determined and it is proved that damage of metal is exactly the plastic change of metal.