四边形

Their ability to draw the picture accurately is impaired especially when the symmetrical axis is tilted. Parallelograms are easily mistaken for line-symmetry diagrams. Point-symmetry diagrams tend to prevent correct identification of line-symmetry diagrams.

学童在画线对称图形另一半的能力有待加强，尤其当对称轴是歪斜时会影响学童画图的准确性；平行四边形易被当成线对称图形，点对称图形也会干扰线对称图形的判定。

The GSP computer-assisted instructional method is used in the former group while the traditional narrative teaching method is utilized in the latter group. The experiment is conducted for 5 weeks, and the teaching content is geometry,(the congruity of two triangles and the properties of parallelograms.) After the five weeks' experiment, a comparison of learning achievements and learning attitudes is made between the two groups. In addition, an investigation of the experimental group's learning attitude computer-assisted instructional method is made.

本实验教学为期五周，内容为国中几何课程，含两三角形全等与平行四边形，经实验教学之后，比较两组学生几何学习成就及数学学习态度之改变和针对实验组使用GSP 电脑辅助学习几何课程的态度调查，研究结果各项资料经统计处理分析之后获得下列三项主要结论

Detecting human is to search a combination of quadrangles constrained by some geometrical and topological relations.

人体检测就是寻找满足一定几何和拓扑约束的四边形组合。

The idea is to put the points and the quadrilaterals in a data structure for fast range searching.

这种方法就是把那些点和四边形放在一个数据结构中用来快速范围搜索。

What we needed was (1) geometry based subdivision,(2) reasonable number of quadrilaterals, and (3) very low computational cost.

我们需要的是：（1）基与几何的再分，（2）合理的四边形数量，（3）非常低的计算成本。

Opengl examples to add two kinds of triangles and quadrilaterals of different types of coloring methods.

详细说明： opengl实例给三角形和四边形添加2种不同类型的着色方法。

In this paper, a new method for eliminating the false intersection points is proposed and refered as the quadrilaterals grouping method.

提出了一种排除无源交叉定位虚假交点的新方法，称为四边形分组法。

The next step in the projection process is the projection of points onto the quadrilaterals.

投影过程的第二步就是把点投影到四边形上去。

Vii Shapes drawn with dotted lines are quadrilaterals. Students do not have the idea of enclosure.

七、认为虚线所构成的图形是四边形，没有封闭的概念。

Decompose the base surface into quadrilaterals using a relative geometric tolerance we used 0.5% in all test examples

使用一个相对的几何公差将基本曲面分解成一些四边形（在下面的实例中我们使用的是0.5

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。