Focal

['fəʊk(ə)l] or ['fokl]

解释:

(adj.) having or localized centrally at a focus; 'focal point'; 'focal infection' .

(adj.) of or relating to a focus; 'focal length' .

以斯拉录入--From WordNet

解释:

(a.) Belonging to,or concerning, a focus; as, a focal point.

校对:赛克

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