1·Can I control the focal length?
我能控制焦距吗？
2·Set the focal length on your lens.
给你的镜头设置焦距。
3·Empty eyes, can not find the focal length.
空洞的眼眸，找不到焦距所在。
4·The iPhone camera has a fixed focal length.
iPhone的摄像头有焦距固定。
5·That cone Angle is directly controlled by the focal length.
圆锥角度直接受到焦距的控制。
6·Camera lenses have two general attributes: f-stop and focal length.
照相机镜头有两项一般属性：f制光圈和焦距。
7·For me, one of the initial questions is how to set the focal length.
对于我来说，一个首要问题就是怎样设置焦距。
8·Two lenses of focal length 10 cm have a combined focal length of 5 cm.
两个焦距都是10厘米的透镜形成的组合透镜焦距为5厘米。
9·This is the ratio of the focal length of the telescope to its aperture.
这是指望远镜的焦距与其孔径的比值。
10·The focal length of the camera lens plays an important role in photo criteria.
摄影机镜头的焦距在摄影规范中起着重要的作用。