zero in on something/someone
phrasal verb with zero verb uk/ˈzɪə.rəʊ/ us/ˈzɪr.oʊ/ zeroes
(把武器)瞄准…,瞄向…
to aim a weapon directly at something or someone
Modern military aircraft use computers to help them zero in on their targets. 现代军用飞机运用计算机来帮助瞄准目标。