/ˌjuː.nəˈlæt̬.ɚ.əl/
done by one member of a group or an organization without the agreement of the other members 单方的
a unilateral decision
单方面的决定
a unilateral declaration of independence
单方面宣布独立
They were forced to take unilateral action.
他们被迫采取单方面行动。
They had campaigned vigorously for unilateral nuclear disarmament (= when one country gets rid of its nuclear weapons without waiting for other countries to do the same).
他们曾致力于单方面裁减核武器运动。