They have very different masses, same radii, same length.
它们材料不同，半径相同，长度相同。
It is now necessary to introduce a sign convention for radii of curvature.
现在必须介绍曲率半径的正负号规则。
The radii of curvature are generally large in order to achieve adequate range of vision.
半径曲率一般都是大，以达到足够的视线范围。如此庞大的半径也有可取的审美原因。
The radii of curvature are generally large in order to achieve adequate range of vision.
半径曲率一般都是大，以达到足够的视线范围。如此庞大的半径也有可取的审美原因。
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