轨迹线

Considering the factors such as randomness of natural lightning locus and the coexistence of primary and secondary leaders, it is necessary to lead in the concept of dynamic lightning protection shielding angle. It is suggested that the angular bisector of practical protective angle formed by ground wire or earth pin in UHVAC transmission line and conductor should be aligned with the direction of lightning leader as well as the ratio of vertical span to horizontal span and the impact of wind speed should be considered.

考虑自然闪电轨迹的随机性和雷电主先导与次先导并存现象等因素，有必要引入动态防雷保护角概念，建议特高压交流线路中地线对导线的实际保护角形成的角平分线应与雷电先导的来向一致，并应计及垂直档距和水平档距的比值和风速的影响。

The brachistochrone of an electric ball in the electromechanical coupling field was investigated according to variational method,and the corresponding governing equation(Euler-Lagrange equation) was derived.

通过变分原理的方法研究力电耦合场中带电小球的最速降线问题，导出其轨迹控制方程，即Euler-Lagrange方程。

For example, logarithmic spirals can also describe the tracks of subatomic particles in a bubble chamber , the arrangement ofsunflower seedsand, of course,cauliflower.

气泡室里的次原子粒子之轨迹即是对数螺线，此外，向日葵种子和青花菜花序的排列也都是。

"Cardioid:a heart-shaped plane curve, the locus of a fixed point on a circle that rolls on the circumference of another circle with the same radius."

心脏线：一种心形的平滑曲线，圆周上一固定点绕另一具有相同半径的圆的圆周转动的轨迹。

The locus of the center s of curvature of a given curve.

渐屈线一给定曲线率中心的轨迹

This paper validated the centrode of six-bar mechanism was similar to circle center curve for different bending radius of the femur, and introduced the gait analysis of knee joint of six-bar mechanism in normal movement to provide theoretical design foundation for developing a new knee joint.

验证了六杆机构的瞬心线与股骨骼不同的弯曲半径圆心线轨迹相似，阐述了机械六杆机构膝关节在正常运动中的步态分析，为研制新型膝关节提供了一定的理论设计基础。

This paper investigated the true propagation paths of acoustic wave in two-dimensional temperature gradient field-single peaked symmetry and deflective respectively, using the two- dimensional acoustic ray tracing method of forward deploying triangle. Besides, a simulating calculation and analysis of this acoustic ray tracing algorithm in model temperature was given.

该文使用二维空间中的三角形前向展开方法，对二维温度梯度场中的声线轨迹进行追踪，并分别在具体的单峰对称温度场和单峰偏斜温度场模型中，对该声线追踪算法进行了仿真计算和分析。

The varying pitch helixes were constructed on the parameter equation, and were selected as sweep trajectory ; the surface of the screw was enveloped on the generating method.

设计过程中按推导出的数学方程构造各段螺旋线，并以该螺旋线作为扫描轨迹，遵循范成法原理包络出螺杆的各段螺旋曲面。

When a round object rolls along a straight line, a track on the round edge is called roulette or cycloid.

当一个圆沿着一条直线滚动时，圆边上一点的轨迹叫做旋轮线或摆线。

When a round object rolls along a straight line, a track on the round edge is called a roulette or a cycloid.

当一个圆沿着一条直线滚动时，圆边上一点的轨迹叫做旋轮线或摆线。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。