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1·The conception of principal direction Gaussian image (PDGI) is created.

提出了基于主方向高斯映射的概念和定义。

2·Precision estimation of principal direction is more objective by using principal stress deflection error proposed in this paper.

提出了主应力的偏角误差概念及其计算方法，使主应力方向的精度评定更加真实客观。

3·The method of determining earthquake input principal direction are studied, which is used for seismic analysis of irregular bridges.

讨论了不规则桥梁地震反应分析中地震动输入主方向的问题。

4·Principal directions of a rotational surface were mapped to Gaussian sphere in the algorithm, and principal direction Gaussian image(PDGI) was generated.

该算法对旋转面主方向映射到高斯球面，生成主方向高斯图像（PDGI）。

5·In the graphical method of the oblique axonometry, the affine transformation is taken as the ellipse's principal direction and the size of the principal radius.

在斜轴测的图解法中，用仿射变换作椭圆的主方向和主半径大小。

6·A great quantity of any Angle strain rosette readings was gathered in structural test, the principal strain and the principal direction were calculated by computer program written in this paper.

在结构试验中采集得到的成百上千个任意角度应变花的读数，可用本文编写的计算机程序确定其主应变及主方向，从而替代了科研人员大量的手工计算。

7·Provide direction to Engineer to design schematic diagram. Principal Engineer may also require designing circuit at components level.

为工程师绘制设计示意图提供指导。必要时在小组阶段进行线路设计。

8·With proper design, the grain flow can be oriented in the direction of principal stresses encountered in actual use.

通过适当的设计，可以使晶粒流动方向与实际使用时的主应力方向一致。

9·The maximUm difference of failure strength among various principal stress direction is up to 30%.

不同主应力方向的破坏强度最大差别可达30%。

10·The principal chess piece, which can move one square in any direction and must be protected against checkmate.

王象棋中主要的棋子，可以向任何方向移动一个方格，但必须保护它不被将死。