A prearranged, formal combat between two persons, usually fought to settle a point of honor.
决斗预先安排的两人间正式格斗，一般是通过斗争解决关系到荣誉的某件事，某一点
The government is determined to combat international terrorism.
政府决定同国际恐怖主义作斗争。
They have a reciprocal agreement to combat terrorism.
他们有相互配合的协定，共同与恐怖主义作斗争。
