英语语法分析

The rotationally symmetrical flange facilitates mounting.

这个旋转对称便于安装。

The practical formulas for the rotationally symmetrical cylinders and cones are derived.

对于回转柱面和锥面导出了实用公式。

Using this model a rotationally resolved spectrum of SF_6 at 20K has been obtained for the first time.

用此模型，首次获得SF_6分子低温条件下（20K）的可转动分辨的吸收光谱和荧光光谱。