focal
gb/fˈoʊkəl/ us/fˈoʊkəl/
B2
英语
~ 9100
义项
0 个义项
adjective
B2
property
1
central or most important
Being the main or most important part of something.
用法模式：
a focal [issue/role/area/point]
常见错误：
Learners sometimes use *focal* where *focused* is needed, e.g. saying "I am focal on my studies" instead of "I am focused on my studies". Another mistake is using *focal* as a noun ("the focal of the story") instead of using "main point" or "focal point".
近义词
central (Very close in meaning; slightly more common and general in everyday use.)
|
key (More informal; emphasizes importance rather than position at the center.)
|
main (Simpler and more common; does not carry the idea of drawing attention as strongly.)
反义词
peripheral (Suggests being at the edge or less important rather than at the center.)
|
minor (Highlights low importance instead of being a main point.)
搭配
focal point
|focal issue
|focal area
|focal role
|focal concern
|focal topic
主题
communication
|work
|society
|core_vocabulary
例句
- The environment became a focal issue in the election campaign.
- Her report was the focal element of the meeting.
- Tourism is a focal part of the region’s economy.
- Education should be a focal priority for the government.
- The new policy makes customer safety a focal concern.
学习者例句
- The main focal point of the talk was climate change.
- Health care is a focal problem in this country.
- In this class, writing is a focal skill.
- Teamwork is a focal value in our company.
- The city made public transport a focal project this year.
adjective
technical
C1
property
2
relating to lens focus
Connected with the point or distance where a camera or lens makes a clear picture.
用法模式：
focal [length/plane/distance]
常见错误：
Learners sometimes confuse *focal length* with physical length, thinking it is the size of the lens body. In optics, *focal length* is the distance from the lens to the point where it makes a sharp image of very distant objects.
近义词
optical (Broader; refers to vision and light in general, not specifically to the focus point.)
|
focus-related (Informal paraphrase used to explain technical meaning to non-specialists.)
反义词
non-focal (Used in technical writing to mean not related to the optical focus or not at the focus point.)
搭配
focal length
|focal plane
|focal distance
|focal ratio
|focal properties
|focal adjustment
主题
science
|technology
|photography
例句
- A longer focal length will give you a narrower field of view.
- The microscope’s focal plane must be adjusted carefully for a sharp image.
- This lens has a fixed focal distance of 50 millimeters.
- The camera allows you to change the focal length with a simple ring.
- He explained how focal properties affect the brightness of the image.
学习者例句
- This camera has a short focal length.
- You must change the focal distance to make the photo clear.
- The picture is sharp when the sensor is on the focal plane.
- A zoom lens can change its focal length.
- We learned how focal length changes what we see in the photo.
adjective
technical
C2
property
3
localized to one body area
In medical language, happening in only one clear part of the body or brain, not all over.
用法模式：
focal [seizure/lesion/deficit]
常见错误：
Learners may think *focal* in this context means "important" because of its general meaning. In medical texts, however, *focal* almost always means "limited to one specific area" and contrasts with *generalized*.
近义词
localized (Very close in meaning; common in both medical and general language for something limited to one area.)
反义词
generalized (Standard medical opposite, meaning spread over a wide area or the whole body, as in generalized seizure.)
|
diffuse (Medical term meaning spread out and not limited to one clear location.)
搭配
focal seizure
|focal lesion
|focal neurological deficit
|focal symptoms
|focal brain injury
|focal abnormality
主题
medicine
|health
|science
|body
例句
- The patient presented with a focal seizure originating in the left temporal lobe.
- MRI revealed a small focal lesion in the frontal cortex.
- Focal neurological deficits suggested damage to a specific brain region.
- The doctor noted focal tenderness over the lower right abdomen.
- These focal symptoms may indicate an early localized infection.
学习者例句
- The scan showed a small focal lesion in his brain.
- She had a focal seizure that started in one part of her brain.
- The doctor looked for focal signs on his right side.
- Focal pain in his chest worried the medical team.
- The report said there was a focal problem in one lung.
语法
词典原形
focal
IPA
GB/fˈoʊkəl/
US/fˈoʊkəl/
音节与重音
fo - cal （2 个音节）
Stress on 1st syllable (fo)
词形变化
Adjective
- Base: focal
词族
Core family
focus
noun A2
focused
adjective
Related words
refocus
verb
Negative and opposite forms
unfocused
adjective
Advanced or less common
focally
adverb
相关表达
focal length
1/fˈoʊkəl lˈɛŋθ/
fixed phrase
technical
distance from lens to focus
The distance between a camera lens and the point where it makes a clear image of a far-away object.
例句
- A lens with a longer focal length will make distant subjects appear closer.
- The photographer adjusted the focal length to capture the whole building.
- In this course, we will compare images taken at different focal lengths.
focal plane
1/fˈoʊkəl plˈeɪn/
fixed phrase
technical
surface where image is sharpest
The flat area inside a camera or other device where the picture is sharp because the lens is focused there.
例句
- The sensor sits on the focal plane of the camera.
- Moving the focal plane slightly can change which objects appear sharp in the image.
- The microscope must be adjusted until the specimen is in the focal plane.
focal point
1/fˈoʊkəl pˈɔɪnt/
fixed phrase
main center of attention
The most important or central thing that people look at, think about, or work on.
例句
- The new park has become a focal point for community events.
- Education is the focal point of the charity’s work.
- The discussion’s focal point was how to reduce costs.
focal seizure
1/fˈoʊkəl sˈiʒɚ/
fixed phrase
technical
seizure from one brain area
A type of seizure that begins in one clear part of the brain, not all over the brain.
例句
- The neurologist diagnosed him with a focal seizure rather than a generalized one.
- Some focal seizures cause only a small movement in one hand or one side of the face.
- Medication can often control focal seizures if the source area is identified.