Therefore,it s worthwhile for the essay to introduce several significant and interesting properties of focus chord,and illustrates their application by examples.
在圆锥曲线中,焦点弦是一个非常重要的几何量,是各类考试的重点和热点,长考不衰,角度常变,可谓考试中的常青树,所以,值得我们研究。
By using transformation thought,this paper obtains the focus chord of all kinds of conic section through analyzing a sample in conic section teaching.
利用变换思想,对圆锥曲线教学中的一道例题进行分析,得出了各种圆锥曲线的焦点弦,并引伸其结论,将圆锥曲线的焦点弦变换为中心弦。
Comparative analysis of the moving of a wave packet in one-dimensional monatomic lattice with that in a string;
原子链与弦中波包演化的比较分析
Lagrangian equations of loops and strings;
环与弦的拉格朗日方程式
bifocal chord of a quadric
二次曲面的两焦点弦
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
He draws back the target arrow at the anchor point with this drawing hand.
他有拉弦手向后拉弓弦直到满弓点。
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
Chord segment joining the two end points of a line
连接测线两端点的弦
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。
The archer draws back the target arrow at the anchor point with is drawing hand.
运动员用拉弦手向后拉弓弦，直到了满弓点。
Effect of striking point and striking dynamics on the amplitude spectrum of piano signals;
击弦点及击弦力度对钢琴幅度谱的影响
Double Focal Switch of Elegant Cosh-squared Gaussian Beams;
复变量双曲余弦平方-高斯光束的双焦开关
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
Great American bronze strings combine the brilliance of 80/20 alloy strings with the great sustain and long-lasting characteristics of phosphor bronze.
琴弦集合了80/20合金琴弦的优点和磷铜琴弦延音出色,经久耐用的特点。
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。