1.
Influence of Laser Distribution on the Thermal Effect of Nd∶GdVO_4 Laser Crystals
不同激光分布下Nd∶GdVO_4晶体热焦距分析
2.
GRAPHIC ANALYSIS OF PLANE PARALLEL RESONATOR AND MEASURE OF THE THERMAL FOCAL LENGTH
平行平面激光谐振腔图解分析及热焦距的测量
3.
Having three focal lengths.
三焦距的有三个焦距的
4.
equivalent focal length
当量焦距，等效焦距
5.
Focus-to-film distance(f.f.d)
焦点-胶片距离(焦距)
6.
A Method for Measuring Thermal Lens Focal Length of End-Pumped Nd:GdVO_4 Crystals
一种测量端面抽运Nd-GdVO_4晶体热透镜焦距的方法
7.
autofocus zoom lens
自动聚焦变焦距镜头
8.
variable focal length (cylindrical) lens
变焦(距)(圆柱)透镜
9.
long focus lens
长焦距（望远）镜头
10.
Focal length: The distance between the centre of a lens and its principal focus.
焦距:镜头中心与其主焦点的距离。
11.
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快速变焦距手术显微镜
12.
Only a bit out of focus.
只是焦距有点不对。
13.
One must focus the camera before taking a picture.
拍照之前先要对焦距。
14.
The image is out of focus.
这影像的焦距没调好。
15.
Don't forget to focus the lens.
别忘了调节镜头的焦距。
16.
rear-controlled zoom lens
背面调整变焦距透镜
17.
best image plane of zoom lens
变焦距物镜的最佳像面
18.
image plane displacement of zoom lens
变焦距物镜像面位移