Students: The length of the curve making a circle is called the perimeter.
生：围成圆的曲线的长度叫做圆的周长。
The length or numerical value of a straight line or curve.
间距直线或曲线的长度或数值
Laying out of highway curve while the length of relaxative curv e of former half curve is not equal to that of latter half curve;
前后缓和曲线长度不同时道路曲线的测设
On a Non-local Perimeter-preserving Curve Evolution Problem for Convex Plane Curves;
平面凸曲线的非局部保长度发展问题
Simplified calculation on length of line-contact of buckling-restrained brace
屈曲约束支撑线接触长度的简化计算
Application of the Length and Parameter of Road Horizontal Transition Curve
公路平面缓和曲线长度及参数的运用
Influence of Track Super Elevation on Curve Radius and Transition Curve Length on Passenger Dedicated Line
客运专线超高对曲线半径及缓和曲线长度的影响
On Transition Curve Design of Monorail Line based on Superelevation Time-variable Rate
基于超高时变率的单轨线路缓和曲线长度设计
The ratio of the change in the angle of a tangent that moves over a given arc to the length of the arc.
曲率切线通过给定弧线的角度变化与弧线长度之间的比率
The Reasearch on the Measurement of R&D Producitivity, Based on the Logistic Model;
基于增长曲线模型的R&D生产率测度研究
a length (straight or curved) without breadth or thickness; the trace of a moving point.
没有宽度或厚度的长度（直或弯曲）；移动的点的迹线。
The drawing of reliable curve
可靠性增长曲线的绘制
On Square Logistic Growth Curve
Logistic平方生长曲线的性质
The curve gives the most complete data on the quality of the colour in question: the hue of the colour is the dominant wavelength which reflected most;
这曲线显示十分详细的颜色特性;反射最强的主波长度就是色相;曲线的位置,表示明度;
The curve theoretically formed by a perfectly flexible, uniformly dense, and inextensible cable suspended from its endpoints.
垂曲线理论上由一条极柔软、密度均匀且长度不变的缆绳从其两端间垂下而形成的曲线
Effects of Teenagers Secular Growth Change and Curve of Growth Veloc-ity on Height Prediction;
青少儿身高的长期变化与生长速度曲线对预测身高的影响
(geometry) a ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis.
描述圆锥曲线部分形状的比率；长轴长度与焦距距离比。
an electric cord used to extend the length of a power cord.
延长电源线长度的电线。