arithmetic

n.算术

argument, argumentation, argumentative, argumentatively, argy-bargy, aria, arid, aridity, aridly, aridness, Aries, aright, arise, arisen, aristocracy, aristocrat, aristocratic, aristocratically, Aristotelian, Aristotle, arithmetical, arithmetically, arithmetician, ark, Arkansas, arm, arm in arm, arm-band (also armlet), armada, armadillo, Armageddon, armament, armature, armchair, armed, armed neutrality, armful, armhole, armistice, Armistice Day (US Veterans' Day),