foreign book 意味

• 洋書｛ようしょ｝、外国語｛がいこくご｝の本
  

例文

1. when they met with each other third time , the friend showed ryoma a handgun which he had bought , but this time ryoma took a foreign book on international public law out of his internal pocket and said to him " from now on , we must know the world ."
   三度再会したとき、旧友が購入した拳銃を見せたところ龍馬は万国公法（国際法）の洋書を取り出し「これからは世界を知らなければならない」といわれた。