come together at a focus; adjust an instrument, etc. so that it is in focus
adjust (a lens, the eye, or lens-like device) to make a clear image
the point at which beams of light or heat or waves of sound meet after their direction has been changed; a center of attention
"the focus of activity shifted to molecular biology"
"he had no direction in his life"
"out of focus"
"the controversy brought clearly into focus an important difference of opinion"
"the focus of infection"
"the stress was more on accuracy than on speed"
"Please focus on your studies and not on your hobbies"
"Focus the light on this image"
"The light focused"
"Please focus the image; we cannot enjoy the movie"
The orbit of a planet..is a broad ellipse in which the sun is..at one focus.
出自： J. Bronowski
I raised the beam of my flashlight.., I focused it..on the hole in the yellow ceiling.
出自： R. Bradbury
Guy tilted forward his glasses and tried to focus the spectacle before him.
出自： O. Manning
He took a little time to focus his eyes properly and decide who I was.
出自： C. Achebe
Electrons can be focussed into narrow beams by electrostatic or magnetic lenses.
出自： H. M. Rosenberg
I focused much of my distemper on London: I noticed only its bad qualities.
出自： C. Priest
一个近视的人不能够准确地调节眼睛以看到远处物体。 focus sth on sth
He focused the sun's rays on a paper with a burning-glass.
If you focus bright sunlight on dry wood with a glass, it will start burning.
假如你用镜子将强烈的阳光聚焦于干燥的木头上,它便会燃烧起来。 focus on sth/v-ing
Today we're going to focus on the question of homeless people.
Many firms are focusing on increasing their markets overseas.
许多商行都在注意在国外扩大市场。 focus sth on sb/sth
He focused his mind on his lessons.
You should focus your attention on your work.
We must focus our attention on the question of reducing costs.
When the coin failed to appear, attention was focused once more on poor Lebeau.
All eyes were focused on him when he came in.
他进来时大家都注视着他。 focus on sth/v-ing
Today, we're going to focus on the relationship between freedom and necessity.
This year our meeting focuses on the question of children's rights.
The show focuses on making fun of politicians.