[jiāo diǎn]
[数] [物] (二次曲线焦点; 主焦点) focal point; focus
virtual focus
虚焦点
principal focus
主焦点
defocus
焦点分散
(问题的关键所在或争论的集中点) central issue; centre; point at issue
the focus of the struggle
斗争的焦点
focal points of contradictions
矛盾的焦点
the heart of the matter
问题的焦点
the points at issue
争论的焦点
[气] origin
[冶] (焦斑) focal spot