focal
gb/fˈoʊkəl/ us/fˈoʊkəl/
B2
Anh
~ 9100
Các nghĩa
0 nghĩa
adjective
B2
property
1
central or most important
Being the main or most important part of something.
Mẫu sử dụng:
a focal [issue/role/area/point]
Lỗi thường gặp:
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".
Từ đồng nghĩa
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.)
Từ trái nghĩa
peripheral (Suggests being at the edge or less important rather than at the center.)
|
minor (Highlights low importance instead of being a main point.)
Cụm từ đi kèm
focal point
|focal issue
|focal area
|focal role
|focal concern
|focal topic
Chủ đề
communication
|work
|society
|core_vocabulary
Ví dụ
- 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.
Ví dụ cho người học
- 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.
Mẫu sử dụng:
focal [length/plane/distance]
Lỗi thường gặp:
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.
Từ đồng nghĩa
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.)
Từ trái nghĩa
non-focal (Used in technical writing to mean not related to the optical focus or not at the focus point.)
Cụm từ đi kèm
focal length
|focal plane
|focal distance
|focal ratio
|focal properties
|focal adjustment
Chủ đề
science
|technology
|photography
Ví dụ
- 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.
Ví dụ cho người học
- 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.
Mẫu sử dụng:
focal [seizure/lesion/deficit]
Lỗi thường gặp:
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*.
Từ đồng nghĩa
localized (Very close in meaning; common in both medical and general language for something limited to one area.)
Từ trái nghĩa
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.)
Cụm từ đi kèm
focal seizure
|focal lesion
|focal neurological deficit
|focal symptoms
|focal brain injury
|focal abnormality
Chủ đề
medicine
|health
|science
|body
Ví dụ
- 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.
Ví dụ cho người học
- 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.
Ngữ pháp
Dạng từ điển
focal
IPA
GB/fˈoʊkəl/
US/fˈoʊkəl/
Âm tiết và trọng âm
fo - cal (2 âm tiết)
Stress on 1st syllable (fo)
Các dạng từ
Adjective
- Base: focal
Họ từ
Core family
focus
noun A2
focused
adjective
Related words
refocus
verb
Negative and opposite forms
unfocused
adjective
Advanced or less common
focally
adverb
Cách diễn đạt
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.
Ví dụ
- 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.
Ví dụ
- 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.
Ví dụ
- 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.
Ví dụ
- 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.