焦距的英文：
focus
- Having three focal lengths.
三焦距的有三个焦距的 - Focus-to-film distance(f.f.d)
焦点-胶片距离(焦距) - This is a long focus lens.
这是个长焦距镜头。 - Adjust the focus of a camera
调整照相机的焦距 - The image got out of focus
这影像没有对准焦距。 - focusing glass [ screen ]
【摄】调焦距用的毛玻璃 - Short focal length (high aperture) lens
短焦距(大孔径)透镜 - The image goes out of focus.
这影像未对准焦距。 - Eyeglasses having trifocal lenses.
有三焦距镜片的眼镜 - The focal length differs with the thickness of the lens
焦距长底随透镜的厚度而变化。
v. （使）集中；（使）聚焦；调节焦距
n. 焦点；焦距；中心
- The image is in focus.
这影像在焦点上。 - Focus your attention on your work.
把注意力集中在你的工作上。 - The research focus of uncommitted robbery has two.
抢劫未遂的研究焦点有二。 - The role of this part is to educe the focus of this article.
这一部分的作用是引出本文的重点。 - "then focus on the colour of the image, "
接着让他们关注图像的颜色
