Non spherical surface lens can get rid of the spherical surface lens' shortcoming and will be highly valuable, so the study of image quality of rotational conicoid and its lens is meaningful.
非球面透镜能够克服球面透镜的缺点，具有很高的实用价值，故对旋转二次曲面及其透镜成像质量的研究将有重要意义。
The sliding surface of s type angular contact spherical plain bearing inner ring is a non -symmetrical spherical surface.
型角接触关节轴承内圈的滑动表面是不对称球面。
Our results indicate that the energy valley of conduction band of Ge is not lying in the center of Brillouin zone and the constant energy surface possesses non-spherical symmetry.
这些结果表明锗导带能谷不在布里渊区中心，且具有非球形对称等能面。
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