在讨论原子级别时间的时候，物理学家用起皮秒（百万兆分之一秒）甚至飞秒（千万亿分之一秒）来都没任何不便。 这是一方面。

Physicists have no trouble using, on the one hand, picoseconds (trillionths of a second) or even femtoseconds (quadrillionths of a second) to discuss time at the atomic scale.

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然而传统的计算公式却比较繁杂、不便，稍不注意，即可引发错误，从面导致出错误判断，留下遗憾或悔恨。

However, the traditional calculation formula is very complicated and inconvenient. One would easily make mistake without more attention, which could cause the wrong judgment with regret forever.

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采用逆向技术路线，通过“点-面”的CAD模型重构过程对不能或不便用CAD功能来表达的手绘图案自由曲面重构进行了研究。

This paper studied on free curved surface reconstruction of hand-drawing with reverse technology and "point-surface" CAD model reconstruction.

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