圆周

The main contents include the ray phenomenon and its generation conditions; the deduction and physical illumination of wave action conservation equation and wave number conservation equation; ray theory for sinusoidal waves; Fermat's principle; the variation of amplitude in the case of straight and parallel depth contours and circular depth contours; the amplitude near the caustics; wave trapping; deduction of mild-slope equation and the relevant numerical solution methods.

讲授折射现象及其发生的条件；波作用守恒方程和波数守恒方程的推导及物理解释；稳恒正弦波的控制方程及射线方程；费马原理；利用射线方程研究等深线是平行直线和圆周线时波振幅的变化，特别是焦散线附近波高的变化以及由此而产生的波的俘获；缓坡方程的推导及有关的数值求解方法。

The algorithm for optimizing the parameters of the measuring system were proposed; The distribution and propagation patterns of the measured errors for all the harmonics of roundness were studied in detail; A software for correcting the errors caused by the measurement error of the angle positions of the probes and the sensitivity difference between three probes was presented.

分析了测头读数及角位置误差对圆度各次谐波及圆周各点测量精度的影响；提出了三点法测量系统的优化策略与算法；研究了三点法测量误差的分布与传递规律；提出了克服测头定位误差以及3个测头的灵敏度不一致影响的软件校正方法。

Each vertex in average distance of each radian located in circumference.

各顶点相互以平均的弧度距离坐落在圆周上。

With the right combination of these dimensions, all six circles will overlap, opening a window in the center to let in a beam of radio signals from an extraterrestrial civilization.

在将这些平面进行正确的组合以后，共计六个圆周将依次重叠，从而在中心部分形成窗口，可使地外文化的射电信号光束通过窗口射入。

The Rotation button is active only if the circle radio button of the selection options is ON.

旋转钮扣是活跃的，只有当如果选择选项的圆周收音机钮扣是开的。

Aligned along the radius of a circle or cross-section.

径向：1。沿着一个圆周的半径或横切面放射状排列。

Due to the technical requirement of the radome,a special modeling method is discussed.

此方法是针对天线罩内廓面的具体情况提出的专用建模方法，分别在圆周方向和母线方向采用三次样条插值方法计算型值点坐标。

Therefore the plunger is in both rectilinear motion and circular motion.

柱塞在运动中既做往复直线运动，同时还做圆周运动，故磨损均匀，使用寿命延长。

Well-to-do Chinese would have started a discussion as to whether the universe moves in cycles or progresses by a rectilinear motion; or they might have set to work to consider whether the truly virtuous man shows complete self-abnegation, or may, on occasion, consider his own interest.

中国绅士却会探讨宇宙是作圆周运动抑或作直线运动；他们也可能陷入思考，考虑真正的君子是应当处处慎独呢，还是有时也可以考虑个人的利益。

For solving regular polygon,the author presents a geometrograph which divides the circumference uniformly and arbitrarily; and derives an analytic expression.

介绍任意等分圆周的几何作图法及所推导的解析表达式，提出用解三角形法解决正多边形零件在设计和加工中的计算问题。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。