1. 聚焦法,对光：focusing screen 调焦屏 | focussing 聚焦法,对光 | focussing glass 调焦屏,毛玻璃板
2. 聚焦：focussing field 聚焦场 | focussing 聚焦 | fodder 临时堵漏的)防水软垫饲料
3. 调焦：焦点 focus | 调焦 focussing | 调焦环;对焦环 focussing ring
noun
1. the concentration of attention or energy on something
e.g. the focus of activity shifted to molecular biology
he had no direction in his life