zero in on

英 [ˈzɪərəʊ ɪn ɒn]

美 [ˈzɪroʊ ɪn ɑːn]

瞄准（目标）; 向…移动; 全神贯注于（问题或主题）

柯林斯词典

PHRASAL VERB 瞄准（目标）；向…移动
Tozero in ona target means to aim at it or move towards it.
1. He raised the binoculars again and zeroed in on an eleventh-floor room.
  他再一次举起双筒望远镜，瞄准了11层的一个房间。
PHRASAL VERB 全神贯注于（问题或主题）
If youzero in ona problem or subject, you give it your full attention.
1. Many of the other major daily newspapers have not really zeroed in on the problem...
  其他许多重要日报并未将注意力集中在这个问题上。
2. Critics have zeroed in on his plan to raise gasoline taxes 10 cents a gallon.
  批评者将矛头对准他打算将汽油税每加仑提高10美分的计划上。