"Japan" . . . . "nihon gaikokukankei." . . "日本 外国関係" . "United States" . . "Kokusaiseiji." . . "国際政治" . "kokusaiseiji." . . "ポスト覇権システムと日本の選択" . . . . "Emerging post-hegemonic system" . . . "Posuto haken shisutemu to nihon no sentaku"@ja . "Posuto haken shisutemu to nihon no sentaku" . . . . . "Posuto haken shisutemu to Nihon no sentaku" . . . . . . . . . . . .