fo·cal
adjective/ˈfəʊkl/
/ˈfəʊkl/
[only before noun]- central; very important; connected with or providing a focus
中心的；很重要的；焦点的；有焦点的 - The Student Liaison Officer acts as a focal point for student political activity.
学生联络官充当学生政治活动的联络人。 - The focal symbol of sovereignty is, of course, the crown.
主权的核心象征当然是王冠。
Oxford Collocations DictionaryFocal is used with these nouns:- point
Word Originlate 17th cent.: from modern Latin focalis, from Latin focus, or directly from focus. - The Student Liaison Officer acts as a focal point for student political activity.