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1.State-centrism
一、國家中心主義
The first assumption of realism is that the nation is the principal actor in international relations.
現實主義的第一個假設是國家是國際關係的主要行為者。
Other bodies exist, such as individuals and organizations, but their power is limited.
也存在其他機構,例如個人和組織,但它們的權力是有限的。