lock-on signal

例句：

1. 1. The lock-on signal was triggered by the proximity of a target.
   锁定信号被目标的接近触发。
2. 2. The team used a lock-on signal to pinpoint the location of the enemy.
   团队使用锁定信号来定位敌人的所在地。
3. 3. In this scenario, the lock-on signal is crucial for accurate targeting.
   在这个情境下，锁定信号对于准确的瞄准至关重要。