focus的过去式是什么

1. （活动、注意力、兴趣等的）焦点，中心，重点，集中点
2. 【地震学】震源
3. 【物】焦点
4. 【光】聚焦，对光；对焦点，聚光点，成像清晰点
5. 【光】（镜头的）焦点，焦距
6. 清晰，明确
7. 【医】病灶
8. 【数】（椭圆的）焦点

1. 集中，使集中于一点
2. 使聚焦，使集中于焦点，特别关注
3. 调焦，调（眼睛、镜头等的）焦距，定…的焦点；使（眼睛）注视
4. 于小区域
5. 使清晰
6. 聚焦，集中于焦点，注视

1. vt. & vi. (使)集中 concentrate
2. vt. & vi. 聚集于 come together at a focus; adjust an instrument, etc. so that it is in focus
3. vt. & vi. 调整(镜头,眼睛)焦点或焦距以便看清 adjust (a lens, the eye, or lens-like device) to make a clear image

1. [C]焦点,焦距; 中心 the point at which beams of light or heat or waves of sound meet after their direction has been changed; a center of attention

1. 焦距：PART 1 数码相机剖析篇 单元1 像素点(pixel) 单元2 拍摄尺寸 (分辨率) 单元3 感光组件--CCD VS CMOS 单元4 光圈(Aperture) 单元5 快门(Shutter) 单元6 焦距(Focus) --定焦与变焦 单元7 对焦模式 单元8 测光模式 单元9 感光

2. 专一化：企业成功的三种基本战略, 有三种提供成功机会的基本战略方法,可能使公司成为同行中的佼佼者: 总成本领先(overall cost leadership)战略 差异化(differentiation)战略 专一化(focus)战略 有时公司可能成功地寻求一种以上的方法作为其基本目标,

3.

3.focus：fiber optic connection universal system; 光纤连接通用系统

4.focus：federation on computing in the united state; 美国计算联盟（国际信息处理联合会属下）

1. A defect of vision prevented him from focusing accurately.
   视力缺陷使他无法准确聚焦。
2. He must be very tired today, he doesn't seem to focus at all.
   他今天一定很累,他似乎无法专心思考。

1. He focuses the lens of a microscope.
   他调整显微镜的镜片以定焦点。
2. His eyes were so tired that he had difficulty focusing it.
   他的眼睛累了,无法准确聚焦。
1
3. Unless the object is properly focused the photograph will be blurred.
   除非把焦距调准,否则拍出的照片是不清楚的。

1. The camera has two focuses.
   这部相机有两个焦距。
2. She was the focus of everyone's attention.
   她是大家注意的焦点。
3. He is adjusting the focus of camera.
   他正在调相机的焦距。
4. The coffee shop is the focus of social life in French.
   在法国,咖啡馆是社交生活的中心。

• 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

focus, centre, centralize, concentrate

这组词的共同意思是“集中”。其区别在于:centre强调事或物所集中的那个中心点; focus强调同类事物汇集在一点上,融成一体; centralize则用于那些能集中又能分散的事或物,尤指集中权力或类似的东西; concentrate强调人类为达到目的而采用的技巧和方法、纪律及为此所做出的努力。例如:

The conversation was centred on the election.会谈的中心问题是选举。

The troops concentrated near the station.集结在车站附近。

He focused the sun's ray on a piece of paper with a burning-glass.他用一面凸透镜把阳光在纸上集成焦点。

She is trying to centralize all power into her own hands.她力图把所有权力集中在自己手中。

concentrate，focus

这两个动词均有“集中，聚集”之意。

concentrate指把人或物集中在一起，也可指把精力或注意力集中于某一事物上。

focus侧重指把光、热、射线等集中于一点，也可指把思想或精力等集中于某人或某事情上。