成一条直线

If a region in the plane is revolved about a line,the resulting solid is called a solid of revolution,and the line is called the axis of revolution.

旋转体就是由一个平面图形绕这平面内的一条直线旋转一周而成的立体，这直线叫做旋转轴。

This paper investigates the converse theorem of rectangular projection theorem in descriptive geometry,and furthermore supplements and confirms another converse theorem,If the projection of two lines intersecting vertically fo rms a rectangle on a certain projecting plane,at least one line of the two lines is parallel to the projecting plane.

通过对《画法几何学》中直角投影定理的逆定理的研究，得出："若垂直相交的两直线在某一投影面上投影成直角，则该两直线至少有一条直线平行于该投影面"的推论。

The math models of the tree structure chart and the net structure chart are formed by describing the different road state abstractly.The tree structure chart model is presented without consideration of U structure and ring structure. This kind of model has a notable feature: there is a line only between the two dot in the chart, which means that there is only one road from one point to another point in expressway ,so the tree structure chart is called "single roads chart".

在不考虑U型路段和环路的情况下，提出了高速公路的树状结构图模型，该模型具有一个显著的特点：图中两点之间有且仅有一条连线，这意味着由高速公路上的一个地点到达另一个地点仅有一条通路，也称这种高速公路树状结构图为"单路径图"；考虑到包含U型路段和环路的高速公路路况，提出了高速公路的网状结构图模型，这种模型可抽象成一个连通图，即图中任意两点之间至少有一条直线相连，这意味着由高速公路上的一个地点到达另一个地点有多条通路，也称这种高速公路网状结构图为"多路径图"。

In some cases, the loop forms a straight line, with a pulley at each end.

在一些情形中，环形成一条直线，藉由一个滑车在每个结束。

T: Please stand in a straight line.

请站成一条直线。

First you must true up the pieces of wood to make a straightedge .

你得先把一块块木头摆正并使边沿成一条直线。

The model of fiber-optic Fabry-Perot interferometer was established when ideal or unideal optical source was applied. Through simulating interferometric signal by computer under the condition of nonmonochromatic light, the symmetry of fringes deteriorated, the fluctuating domain of fringes became small as the ratio of cavity length to coherence length increasing.

推导了光源在理想情况和非理想情况下的光纤Fabry-Perot干涉模型，通过计算机模拟了干涉信号，指出在非单色光源下，干涉条纹失去周期性，随着腔长相干长度比增加干涉条纹的变化幅度减小，最后演化成一条直线，条纹的可见度也慢慢趋近于零。

1Also known as the French baroque style of Louis XIV of France, and its furniture is characterized by: majestic, with exaggerated, the classical form of thick, elegant graceful emphasis on comfort, Although the use of the mat, using a straight line, and some combination of arc-shaped curve and rectangular, symmetrical structure features, the use of oak, walnut and some European and Lei Muk forging, inlay with wood plaque, wooden shovel, such as Liriodendron, furniture bottom have braces, structural firmly until late cancellation rungs; both carving and fine inlay work, or part of another gold-plated or gold-plated silver, mosaics, painting, painting, in this period of the development process, the original straight leg into a curve leg, Desktop for the marble and fine嵌石workers, high armchair, wall layout with well-carved bracing the lower part of the snail-shaped narrow leg platform; decorative patterns, including the rising sun inlay gemstones have shaped pins around head-ray, in the oval with a double "L"-shaped, forest god of the mask,"C""S" shaped curve, dolphins, face lion body, head and claws, rams head, or turtle, olive leaves, diamond-shaped flower, fruit, butterflies, palms and water lily leaves short irregular dispersed layout and human fable of ancient weapons.

1也被法国路易十四的法国巴洛克风格而知名，其家具的特点是：雄伟，与夸张的厚，优雅舒适优雅的古典形式强调，虽然使用垫，用一条直线，和一些弧形曲线和矩形，对称结构特点，是橡木，胡桃木和一些欧洲及梨木锻件，与木牌匾，木铲，如鹅掌楸，镶嵌组合使用，家具底部有括号，年底之前取消结构梯级坚决的，都镶嵌雕刻和优良的工作，或另一个黄金的一部分，在这一发展过程期间，原直镀镀金银，马赛克，油画，油画，腿成一条曲线，对大理石和精细嵌石工人，高椅，与井壁的布局桌面腿雕刻支撑的蜗牛下部形窄腿平台；装饰图案，包括旭日镶嵌宝石塑造针围绕头线，在椭圆形双的&L&形，森林之神的面具，在&C&的&S&形曲线，海豚，面狮身，头和爪，公羊头，或龟，橄榄叶，菱形花，果，蝴蝶，棕榈和睡莲叶短不规则分散布局和古人类寓言武器。

In addition, when the club face open, plug the left side of the line coincides with the leading edge of the arc into a straight line to connect to aim the ball will not have any impact.

此外，在打开杆面时，插销左侧的线正好与前缘的圆弧连接成一条直线，对瞄球不会产生任何影响。

Modern astronomers has proved to be the ancient Maya predicted in 2012 on 21 December, the Earth, the Sun and the Galactic Centre will precisely in a straight line, the astronomical events only every other year 25800 occurs only once, no one knows this unusual arrangement on earth can, but the Mayan people know this is terrible.

现代天文学家已证实古玛雅人所预言的在2012年12月21日，地球，太阳和银河中心将精确地排列成一条直线，这个天文现象只有每隔25800年才会发生一次，没人知道这种非同寻常的排列方式对地球会有怎样的影响，但玛雅人知道这是可怕的。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。