focus
n. 焦点, 焦距 vi. 聚焦, 注视 vt. 使聚焦, 调焦, 集中 [计] 焦点
发音
词形变化
教材释义与例句
焦点；中心；清晰；焦距
the thing, person, situation etc that people pay special attention to
使集中；使聚焦
to give special attention to one particular person or thing, or to make people do this
集中；聚焦；调节焦距
释义与例句
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1.
A point at which reflected or refracted rays of light converge.
焦点
可数 工程 物理 不可数The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.
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2.
A point of a conic at which rays reflected from a curve or surface converge.
可数 数学 不可数 -
3.
The fact of the convergence of light on the photographic medium.
不可数 艺术 媒体 可数Unfortunately, the license plate is out of focus in this image.
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4.
The quality of the convergence of light on the photographic medium.
不可数 艺术 媒体 可数During this scene, the boy’s face shifts subtly from soft focus into sharp focus.
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5.
Concentration of attention.
集中
不可数 可数I believe I can bring the high degree of focus required for this important job.
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6.
Something to which activity, attention or interest is primarily directed.
可数 不可数My studies are my main focus right now.
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7.
The exact point of where an earthquake occurs, in three dimensions (underneath the epicentre).
可数 地质 不可数The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.
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8.
The status of being the currently active element in a user interface, often indicated by a visual highlight.
可数 不可数 计算机 工程 数学Text entered at the keyboard or pasted from a clipboard is sent to the component which currently has the focus.
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9.
The most important word or phrase in a sentence or passage, or the one that imparts information.
可数 不可数 语言学 -
10.
An object used in casting a magic spell.
可数 不可数 -
11.
The centre of an older fish's scale, which is the point where a younger fish's scale starts to grow from.
可数 不可数 生物 动物学
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1.
To cause (rays of light, etc) to converge at a single point.
及物 -
2.
To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
及物 工程 物理You'll need to focus the microscope carefully in order to capture the full detail of this surface.
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3.
To adjust itself or be adjusted such that light from a scene converges appropriately to create a clear image.
不及物 工程 物理I can't get the lens to focus.
The camera focuses automatically on the subject's eyes.
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4.
To direct attention, effort, or energy to a particular audience or task.
及物The president focused her remarks on the newcomers.
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5.
To concentrate one’s attention.
不及物If you're going to beat your competitors, you need to focus.
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6.
To concentrate one's attention on something; to have as one's central point of interest, concern, etc.
集中
不及物I have to focus on my work.
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7.
To transfer the input focus to (a visual element), so that it receives subsequent input.
及物 计算机 工程 数学The text box won't receive the user's keystrokes unless you explicitly focus it.
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8.
To aggregate figures of accounts.
金融 商务
词汇关系
相关短语
词源
Borrowed from Latin focus (“hearth, fireplace”); see there for more. Related to fuel. Kepler introduced the term into mathematics and the sciences in describing elliptical orbits of planets (quote from Nicholas Mee) : "One of the interesting properties of an ellipse is that if there were a light bulb at one focus, then all the light that it emits would reflect off the ellipse and converge at the other focus. This is why Kepler originally used the name focus for these points."
来源：wiktionary