Homogeneous Second System of Center-focus Type to System Concluding Parameters;
中心-焦点型齐二次系统参数化简问题
Designed principle of the rotational stand uses for measuring a camber with double focuses;
一种双焦点曲面的测量用转动架的设计原理
A kind of directness arithmetic about conic′s focus;
二次曲线焦点的直接求法
Of or relating to a focus.
焦点的焦点的或与焦点有关的
A Survey of Studies on Focus;
焦点、焦点结构及焦点的性质研究综述
Focus-to-film distance(f.f.d)
焦点-胶片距离(焦距)
To adjust or come to a focus.
使聚焦调整或达到焦点
Placed at or measured from a focus.
焦点上的设置在焦点上的或从焦点处测量的
(optics) having two foci.
（光学）有两个焦点。
focus of action awareness
动作意识焦点 动作意识焦点
Identification of Unmarked Focus and Marked Focus;
无标记焦点和有标记焦点的确定原则
The act or result of causing a lens to deviate from accurate focus.
散焦，去焦使透镜偏离准确的焦点的行为或结果
To converge on or toward a central point of focus;be focused.
集中于焦点在中心焦点或向中心焦点集中；被集聚
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。
Having the same focus or foci. Used of a lens.
共焦的有共同焦点的。用于透镜
flat-top plastic bifocal
平顶塑料双焦点透镜
The focus of this photograph isn't very sharp.
这张照片的焦点不清晰。
country focus policy
以国家为焦点的政策
bifocal chord of a quadric
二次曲面的两焦点弦
The pay increase is the key point of contention.
加薪是争论的焦点。
