The two boys were sworn friends all the week, and embattled enemies on Saturdays.

这两个男孩整个星期都是结拜的朋友，但在星期六却与敌人四面楚歌。

Jefferson, the friend of France and sworn enemy of England, compelled to choose in the interest of America, never winced.

——杰斐逊， 法国的朋友， 英国的死敌，被迫为了美国的利益做出选择， 从不退缩。