在过去的七年间，一个新的部门——国土安全部成立了。
Over the past seven years, a new Department of Homeland Security has been created.
在过去的八年间，一个新的部门——国土安全部成立了。
Over the past eight years, a new Department of Homeland Security has been created.
在过去的八年间，一个新的部门——国土安全部成立了。
Over the past eight years, a new Department of Homeland Security has been created.
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