英语词汇“focus”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

a point at which rays of e.g. light, heat, or sound converge or from which they diverge, or appear to diverge, after reflection or refraction

the point at which an object must be placed for an image formed by a lens or mirror to be sharp

= focal length

adjustment, e.g. of the eye, necessary for distinct vision

a state in which something must be placed in order to be clearly perceived

bring the issues into focus

a centre of activity or attention

the focus of the meeting

a localized area of disease or the chief site of a generalized disease

a fixed point that together with a straight line forms a reference system for generating a conic section in plane geometry

either of two fixed points used in generating an ellipse or hyperbola

the place of origin of an earthquake

in focus

having or giving the proper sharpness of outline due to good focusing

out of focus

not in focus

[Latin focus hearth]

verb trans

(often + on) to bring (e.g. light rays) to a focus

(often + on) to cause (one's thoughts, etc) to be concentrated

They focused their attention on the most urgent problems

to adjust the focus of (e.g. a camera or telescope)

to bring (e.g. a view) into focus

verb intrans

to come to a focus; to converge on a point

to form into a sharp beam, e.g. of light

to bring one's eyes or a camera into focus

focuser noun