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1·Both of the formation possibility of the coupled twins and single twin induced by impurity atom are 50%.

杂质原子诱发成对孪晶及单孪晶的的可能性各为50%。

2·Point defect - a crystal defect that is an impurity, such as a lattice vacancy or an interstitial atom.

点缺陷-不纯净的晶缺陷，例如格子空缺或原子空隙。