She derived another formula relating the number of folds possible in one direction (n) to the minimum possible length of material (l) and the material's thickness (t)

她推导出了另一个关于折叠次数（n）、现实的最小长度（l）以及材料厚度（t）的关系式。

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The same functionality could be derived by using CHARACTER_LENGTH and using OCTETS as string length units.

使用CHARACTER_LENGTH并使用OCTETS作为字符串长度单元时也会产生同样的功能。

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By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.

用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。

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"The merger ratio does not reflect BAE's superior cash generation, or the quality of its earnings stream, derived from the length and nature of its customer contracts, " Invesco said.

BBC: BAE Systems: Invesco warns over EADS merger plan