focal

US /ˈfoʊ.kəl/
UK /ˈfoʊ.kəl/
"focal" picture
1.

焦点的, 中心的

relating to the focus of a lens or mirror

:
The camera's focal length determines the field of view.
相机的焦距决定了视野。
Adjust the lens to achieve a clear focal point.
调整镜头以获得清晰的焦点
2.

核心的, 主要的

of or relating to a central or most important point

:
The focal issue of the debate was climate change.
辩论的焦点问题是气候变化。
The city's new park will be the focal point of the community.
城市的新公园将成为社区的焦点