50mm by 6mm
问题描述：
50mm by 6mm
在一篇国外文献中看到这样一句话 prepare specimens with dimensions 50mm by 6mm (2 in.by 0.25 in.) by product thickness.
答
这里的 by 相当于我们常说的 乘.50mm by 6mm 就是50mm 乘 6mm,也就是50mm x 6mm x 产品厚度.