投影线

According to the mapping principle of stereographic projection, the combinatorial relationships of line and plane can be solved by use of mathematic analysis.

摘要根据赤平投影的成图原理，利用数学解析的方法，可直接求解有关线与面的组合关系。

Firstly, the developing principles of the cylindrical internal helical gear are proposed through analyzing the movement and geometry requirements, which provides continuous contact between the mating gear surfaces. The tooth surface of the internal helical gear in the new gearing can be imagined as being generated by the normal section of the conjugated surface of the ball-tooth, moving along the radial projection of helix line of the tooth-root circle. Also, the proposed surface can be approximate tangent to the conjugated surface of the ball-tooth along a spacial curve.

首先，通过分析保证行星轮作螺环运动时与内斜齿轮实现连续啮合传动的运动和几何条件，提出了圆柱内斜齿轮齿面的两种形成原理：即由球齿运动包络曲面的法截面沿其齿根圆螺旋线在径向的投影进行拓展所形成的内齿面，以及与球齿运动包络曲面呈近似相切接触的等螺距齿面构成的内齿面。

A scanning pattern of parallel lines that form the display of an image projected on a cathode-ray tube of a television set or display screen.

光栅：一种并行线扫瞄的形式，会在电视机或放映屏幕的阴极光线管上投影出影像

By the establishment of the related computer program,the various improvement to the traditional method is made,and the method of vector algebra is applied to calculate the safety factor of block model.The automatic implementation of the stability analysis and evaluation of weage rock mass are acchieved by the program.

传统的做法是在野外结构面测量的基础上，通过手工赤平投影的方法，确定各结构面的交线产状，由此确定滑面的大小及楔形体上的作用力[3]；最后在明确了楔形体大小和受力的基础上，用极限平衡理论计算楔形体的稳定性[4]。

The knowledge of relationship between cutaneous nerves and veins in the dorsal of hand could help us to reduce the pain of patients during venepuncture.

①由尺骨茎突、桡骨茎突和第三掌骨头形成的三角形区域为"乏神经区"；②由尺骨茎突至第3、4指蹼和由桡骨茎突至第1、2、3指蹼的连线为掌背皮神经的体表投影；③注意这些解剖学关系，在静脉穿刺时可减少病人痛苦。

Chapter 3: Using spectral projected gradient method and a new nonmonotone line search technique, we propose a algorithm for solving the trust region subproblem. Under weak conditions, the global convergence is established.

第三章：利用谱投影梯度方法与一个新的非单调线搜索技术给出了求解信赖域子问题的一个方法，在一般的假设条件下获得了方法的全局收敛性。

Topography map of the hip bone displays the depth of all parts of the hip bone and the projection of important blood vessel and nerve onto the hip bone imaginarily and directly.

将坐标系、等厚线和重要血管神经的投影图同时绘制在髋骨上，形成3张地形图，1张为髋骨内侧面地形图，1张为没有血管和神经结构的髋骨外侧面地形图，1张为有血管和神经结构的髋骨外侧面地形图。

Results The pudendal nerve′s location was about 12 mm medialis to the middle and lower 1/3 point of the line between posterior superior iliac spine and ischial tuberosity. The maximal free length of the pudendal nerve was (38.74±1.39)mm from the start point to the superior border of sacrotuberous ligament.

结果：阴部神经的体表投影为髂后上棘与坐骨结节连线的中下1/3内侧12 mm，其可游离的最大长度（自起始处至骶结节韧带上缘）为(38.74±1.39)mm。

A novel method for measuring dense-line depth of focus of a lithographic projection system is proposed.

提出了一种检测光刻机投影物镜密集线焦深的新技术。

Methods: Thirty-five sets of normal adult dry cervical vertebrae and 100 sets of X-ray and CT films were measured, including pedicle width, height, length, projection, pedicle-body angle, lateral mass width, height, thickness, the distance and angle between the central point on the back wall of the lateral mass and the foramina transverse foramen, the supra articular process-body angle.

对35套正常成人颈椎干燥骨标本以及100套X线片和CT片进行测量，包括椎弓根宽度、高度、长度、投影点位置、与椎体的夹角、侧块宽度、高度、厚度、后壁中心点与横突孔的距离和夹角、上关节突的倾角等。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。