1.
actinic focus
【物理】光化学线焦点
2.
concentrate rays of light into a focus
把光线集中在焦点上
3.
"A convex lens causes rays to converge on a single point, the focal point."
会聚透镜使光线会聚于一点,即焦点。
4.
The midpoint Between the foci is the center. One property of an ellipse is that the reflection off its Boundary of a line from one focus will pass through the other.
焦点之间的中点为中心。椭圆的一个特性是:连自一个焦点的直线边界反折会通过另一个焦点。
5.
Analysis and Measurement of Spot Focusing Lens Antenna Resolution
点聚焦透镜天线分辨率的分析与测量
6.
② when , the horizontal projection curve of the intersection curve is the Cassini oval family which is confocal.
②当时，为共焦点的卡西尼卵形线族；
7.
The Research on the Generalized Elliptic Curve with Three Foci;
“三焦点”广义椭圆曲线及其传动特性
8.
Research on the X-ray Imaging Based on Micor-Focus
微焦点X射线源成像质量分析与研究
9.
The Research on the Generalized Elliptic Curve with Three Foci
“三焦点”广义椭圆曲线及其传导特性
10.
Notice that in all cases, the rays either diverge from or converge toward the foci.
注意在所有的情况下，光线不是从焦点发散就是会聚到焦点。
11.
A fixed point whose relationship with a directrix determines a conic section.
焦点一个与准线的关系决定圆锥形状的定点
12.
Decision Theorems for the Center and Focus of a Class of Nonlinear Differential Equati ons
一类非线性微分方程组的中心和焦点判定定理
13.
Design of a Control System of Compensation for the Focal Displacement of Feed of a 50m Antenna
50米天线馈源焦点偏移补偿控制系统的设计
14.
Research on Meridian Lines Design for Progressive Addition Lenses
渐进多焦点眼用镜片的子午线设计研究
15.
Of or relating to a focus.
焦点的焦点的或与焦点有关的
16.
A Survey of Studies on Focus;
焦点、焦点结构及焦点的性质研究综述
17.
Evaluation of Online Knowledge Communication Based on Focus Group
基于焦点团体的在线知识交流评价——以在线参考咨询工具Wiki为例
18.
Focus-to-film distance(f.f.d)
焦点-胶片距离(焦距)