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“一刀两断”，汉语成语，字面意思是一刀斩为两段（cut in two with one stroke of the knife），比喻坚决断绝关系。可以翻译为“make a clean break with，break off all relations with”。
例句：
与家庭一刀两断Cut the knot from the family; break off all relations with the family
我们必须与旧思想一刀两断。We must make a clean break with old ideas.
Editor: Jade
来源：chinadaily.com.cn