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1.She asked the Homeland Security Department for a security period that would end on January 24th.
security 安全
She hasn't been cleared by security.
她尚未获保安部门批准做机要工作。
2.She asked the Homeland Security Department for a security period that would end on January 24th.
period 期间
The patients were observed over a period of several months.
这些病人被观察了数月之久。
