1N-COUNT 靶心The bull's-eye is the small circular area at the centre of a target. 靶心
Five of his bullets had hit the bull's-eye.
他有5发子弹打中靶心。
2N-COUNT 命中靶心的一击 In shooting or the game of darts, a bull's-eye is a shot or throw of a dart that hits the bull's-eye. 命中靶心的一击
3N-COUNT （做事、说话命中的）要害 If something that you do or say hits the bull's eye, it has exactly the effect that you intended it to have. （做事、说话命中的）要害 [informal]