圆环面

The Saracen came on at the speedy gallop of an Arab horseman, managing his steed more by his limbs, and the inflection of his body, than by any use of the reins, which hung loose in his left hand; so that he was enabled to wield the light round buckler of the skin of the rhinoceros, ornamented with silver loops, which he wore on his arm, swinging it as if he meant to oppose its slender circle to the formidable thrust of the western lance.

撒拉逊人用阿拉伯骑士惯常的高速冲来，他靠移动身子操纵坐骑，很少动用松松地挂在腕上的缰绳，空出来的左手拿着一面包着犀牛皮的圆盾，盾上的银环套在他的臂上，现在他晃着这面小盾，象是要靠它来抵挡西方人长矛的猛刺。

When the ratio of central obscuration is small, the circular polynomial with 9 terms could take place of the annular polynomial to solve the SEIDEL coefficients in some special situations.

在某些特殊情况下，对于中心遮拦很小的环孔径波面，可以采用9项Zernike圆多项式来代替环多项式进行拟合求取SEIDEL系数。

An instrument that measures the outer profile parameters of piston rings such as conical rings, tubbish rings by scanning is introduced.

介绍一种采用扫描方式测量锥面环、桶面环等活塞环外圆轮廓参数的测量仪。

In this paper, the finite element method is used to analyze the centri- fugal deformation of the currently-used hollow spherical rotor used in electrostatic gyro.

本文从静电陀螺捷联系统应用方案考虑，用有限元法分析我国现有结构静电陀螺空心转子离心变形，转子结构模型的内表面由赤道环、过渡圆和圆球面三部分组成，外表面为椭球面。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。