This is the 3313th most frequent Chinese word.
国防部
Ministry of National Defense
In this sentence, '国防部' is used as the subject, referring to the governmental organization responsible for national defense.
国防部宣布了一项新的国家安全政策。
The Ministry of National Defense announced a new national security policy.
Here, '国防部' is part of a prepositional phrase, specifying the entity related to the subject matter of the sentence.
这个国家的国防部对于军队的管理负有重要责任。
The Ministry of National Defense in this country holds significant responsibility for military management.
In this example, '国防部' functions in genitive form, denoting possession related to the press conference.