secondary focus
焦点副词 focus adverb ; focusing adverb
事实上，出乎人们意料的副主统的候选人成为本周焦点。
In fact, much of the attention this week went to the surprise choice for vice President.
youdao
平行于跟主光轴夹角不大的副光轴的光线。经透镜折射后会聚（或发散光线的反向延长线）于该副轴上的一点，副焦点都在焦平面上。 副焦点位置
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