1. self-focusing of laser beam 
   光束自聚焦
2. Light is condensed by means of lenses. 
   光线由透镜聚焦。
3. A range in relation to an optical system, such as a camera lens, representing distances great enough that light rays reflected from objects within the range may be regarded as parallel. 
   （聚焦区）无限远与光学系统（如照像镜头）有关的一个范围，表示距离是如此之远，以至于从在这一距离的物体上反射回来的光可以视为平行光线
4. The telescope got out of focus. 
   望远镜聚焦不稳了。
5. To adjust or come to a focus. 
   使聚焦调整或达到焦点

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