focus

vt.

1. 使聚焦[（+on）]
2. 调节（镜头等）的焦距[（+on）]
   You can focus your telescope on that distant television tower.

   你可以对着那座远方的电视塔调节望远镜的镜头。

3. （调节镜头的焦距）使（图像等）清晰
4. 使集中[（+on）]
   I can't focus my thoughts today.

   今天我的思想集中不起来。

vi.

1. 聚焦
   A defect of vision prevented him from focusing accurately.

   视力上的缺陷使他不能准确对焦。

2. 调节焦距[（+on）]
3. 集中[（+on）]
   The beams of light moved across the sky and focused on the plane.

   光束在空中移动，集中对准飞机。