1N-UNCOUNT (战争或冲突中具有的)优势;优越(性) If one side in a war or conflict has superiority, it has an advantage over its enemy, for example because it has more soldiers or better equipment. (战争或冲突中具有的)优势;优越(性) [formal] [Also + over/in]
The US will need a three-to-one superiority in forces to be sure of a successful attack.