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n (1) 焦點(point in a system of lenses or another optical system at which rays of light come together or from which they appear to spread) [C]：principal/real/virtual～(物)主/實/虛焦點;bring sth/come into～焦點對準(zhǔn);清晰;(be/go) out of～焦點沒對準(zhǔn);模糊;

(2) 焦距(point of distance at which an object is clearly seen by the eye through lens) [U]：take out the binoculars and adjust the～拿出望遠(yuǎn)鏡調(diào)節(jié)焦距;the right～for getting a distinct image 能看清遠(yuǎn)處景象的正確焦距;

(3) 調(diào)(聚)焦(器) (adjustment of an optical device necessary to produce a clear image) [C]：the～on the camera/the telescope 照相機/望遠(yuǎn)鏡上的調(diào)焦器;

(4) 興趣，(注意，活動的)中心(center of interest，attention or activity)[C，通常sing]：want to be the～of everyone's attention 想成為每個人注意的中心;(café) be the～of social life in many French towns (咖啡館)是法國許多城市社交生活的中心;(changes in the urban environment) be the～of public interest (城市環(huán)境的變化)是公眾關(guān)心的中心問題;〖同〗center，middle，heart，core;

v (1) 調(diào)(聚)焦(adjust the distance to get a clear picture) [T+n，T+n+prep(on)]：Remember to～the camera/the picture before taking the photograph. 記住在拍照片之前，先調(diào)好相機的焦距/圖像的距離。A camera lens～es light on the film. 相機的透鏡把光線聚集在膠片上?！玹he telescope on that distant lighthouse/the aircraft 把望遠(yuǎn)鏡對準(zhǔn)遠(yuǎn)處的燈塔/飛機;〖同〗center，fix;

(2) 1) 專心于(concentrate on) [I，I+prep(on)]：I'm so tired that I'm not～ing very well. 我太累了，無法集中注意力。Public attention～ed on the election/the Olympics/the problem of industrial relations. 公眾的注意力集中在選舉/奧運會/勞資關(guān)系問題上。2) 把(精神、注意力)集中于(direct (one's attention，etc) to) [T+n，T+n+prep (on)]：～one's thoughts 集中思想;～one's mind on work/the main problem 將心思集中在工作/主要問題上;～one's attention on the injustice of the situation/the meaning of each sentence 把注意力集中在不公平的情況/每個句子的意思上;

【辨異】 focus與concentrate的區(qū)別見CONCENTRATE。