optical l thickness 光学厚度
material l thickness 料片厚度
total l board thickness 印制板总厚度
digital l ultrasonic thickness gauge 数字式超声波测厚仪
useful l seam thickness 可采层厚度
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。
Therefore, the thickness must be proportional to the length l and therefore the thickness of the femur must be proportional l A very interesting result.
因此股骨厚度的,必然与其长度l成正比,因此股骨厚度,必然与,的3/2次方成正比。，to，l，to，the，power，three-halfs。,很有意思的结论。
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