焦距的英文：
focus

参考例句：
  • 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。
focus是什么意思：
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

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