arms race

competition among nations in which each tries to become militarily stronger than the others 军备竞赛.

armature, armchair, armed, armed neutrality, armful, armhole, armistice, Armistice Day (US Veterans' Day), armlet, armor, armorial, armory, armour, armour (US armor), armour-plate (US armor-), armoured (US armored), armourer (US armorer), armoury (US armory), armpit, arms, army, aroma, aromatic, arose, around, around the clock, arousal, arouse, arpeggio, arr, arrack, arraign, arraignment, arrange, arrangement, arrant, array, arrear, arrears, arrest,