警方将注意力集中在嫌疑人的最后出现地点。

The police are ___zeroing in on the suspect's last known location.

调查人员正在集中精力寻找线索。

The investigators are ___zeroing in on finding the clues.

射击前，他花了些时间校准步枪的瞄准器。

Before shooting, he spent some time ___zeroing the rifle's sights.

科学家们正集中精力研究这种新病毒的传播途径。

The scientists are ___zeroing in on the transmission routes of the new virus.