成一直线

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。

Based on the Guldin's first theorem, it was deduced that the general formula to calculate the rotating surface area which is shaped by rotating the curve Г in a plane around the L-axis in the space by using curve integral.

依据古鲁金第一定理推证，得到利用曲线积分计算空间某一平面上的曲线Г绕直线L旋转而成的旋转曲面面积的通用公式；利用曲线积分计算xoy面上的曲线c绕直线L旋转而成的旋转曲面面积的通用公式。

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。

Further, looking at the overall plan of the city, Paris' most important historic sites -- the Bastille Square, where the French Revolution exploded, the Paris City Government Building, the Louvre, Le Carrousel Arch, Place de la Concorde , the Champs Elysee and the Arc de Triomph -- are arranged in a straightline running east to west, cutting Paris into almost equal halves.

另外，从整体都市架构来检视，巴黎市最重要的历史性地点，从爆发法国大革命的巴士底广场开始，经巴黎市政厅、罗浮宫、卡胡塞凯旋门、协和广场、香榭丽舍大道至凯旋门止，由东向西正好排成一直线，将巴黎分割成大略相等的南北两部分。

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。

The Chinese machines converted rotary motion into longitudinal motion, because they started with the water-wheel, whereas the European machines converted longitudinal into circular motion, but in all other respects they were identical.

中国机械把圆周运动转换成直线运动，因为一开始使用的就是水轮；反过来，欧洲机械则把直线运动转换成圆周运动；两者在其余各方面基本上完全一样。

Http://www.changanyuan.commotion, because they started with the water-wheel, whereas the Europeanmachines converted longitudinal into circular motion, but in all other

长安源社区http：//www.changanyuan.com 译文：中国机械把圆周运动转换成直线运动，因为一开始使用的就是水轮；反过来，欧洲机械则把直线运动转换成圆周运动；两者在其余各方面基本上完全一样。

Linear motor is a kind of equipment for converting electrical energy into linear movement use. In most occasions where need converting rotary movement into linear movement, linear motor shows its superiority. It makes many in-between transferring machine unnecessary. Therefore, the whole system runs more steadily. In addition, thanks to the reducing of the in-between machine, the friction wastage of the whole system is reduced and the efficiency of the whole system is improved.

直线电机是一种将电能直接转换成直线运动机械能的驱动装置，在许多需要由旋转运动转换成直线运动的场合下使用，它可以省却中间机构，从而使装置得以简化，减少了维护的工作量，提高了系统的可靠性，且易于控制，在合适的使用场合下，还可以提高整个系统的效率。

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。

In her eyes, because that is the doorway toher heart * the place where love resides.

女人的漂亮必須從她的眼睛中去看，因為那是她心靈的窗戶和愛居住的地方

I will send some postcards to you.

我会向你发送一些明信片。