1.
The Tri chord Theorem and Ptolemy s Theorem are Equivalent to Each Other;
三弦定理和Ptolemy定理等价
2.
New Proving of the Law of Cosines and the Law of Sines in En
E~n中n维余弦定理和正弦定理的新证明
3.
Its range is generally five octaves and three-eighths.
一般按四五度定弦，音域三个八度。
4.
Axiomatic Definition of (Co)sine with Complex Variables;
复变量正余弦函数的公理化(等价)定义
5.
There are two strings, with a four- or five-octave range.
张两弦，按四五度定弦。
6.
Design of Controllers and Exponential Stability of a Triangle Loop Strings Network System
三角形回路弦网络系统控制器设计及指数稳定
7.
a stringed instrument that has triangular body and three strings.
带有三角形的身体和三根弦的弦乐器。
8.
Returns the trigonometric cosine of the given angle (in radians) in the given expression
返回给定表达式中以弧度表示的给定角度的三角余弦
9.
Sine Rule Is Equivalent for That Vertical Line of a Line Crosses Its Slant Lines;
正弦定理与一条定直线的垂线和斜线一定相交的等价性
10.
The calculation principles of "hypotenuse-height method" and "three-point method" are different, but the methods of dealing with the traces are identical.
弦高法和三点法的计算原理有所不同，但痕迹的处理方法是一致的。
11.
Returns the trigonometric sine of the given angle (in radians) in an approximate numeric (float) expression
返回近似数字（浮点）表达式中以弧度表示的给定角度的三角正弦
12.
The third tone in a diatonic musical scale, determining the major or minor quality of the tonic chord.
中音大小音调中的第三音阶，其决定注音和弦的主音色或次音色
13.
Distinguish tri-port sinusoidal oscillator phasic balance by reactance line
基于电抗性质线判定三点式正弦波振荡器的相位平衡
14.
he instrument has two strings with a four-octave range, and it is played with a horsetail-hair bow on the outside of the strings.
张弦两根，四度定弦，用马尾弓在弦外拉奏，
15.
One of the pegs securing the strings and regulating their tension on a stringed instrument.
弦轴，琴轸用来固定弦或调弦的松紧的部分
16.
This article refers to: the fixing-string (movable-doh) method and the mode, the feature of the open string of the fixing-string method, the fixing-string method and the range, the fixing-string method and the key, and the special fixing-string method of the erhu.
弦法与调式、弦法的空弦特色、弦法与乐曲音域、弦法与调、二胡的特殊定弦法。
17.
slim-delta aircraft
小展弦比三角翼飞机
18.
Kirchhoff Index of Three Special Classes of Chordal Graphs
三类特殊弦图的Kirchhoff指标