Nature staff discuss some of the week’s top science news.
1// just before lowering to IR in Lower::ir_from，更多细节参见新收录的资料
Что думаешь? Оцени!。业内人士推荐新收录的资料作为进阶阅读
In the derivation, we find that the mean free path λ\lambdaλ is inversely proportional to this area and the number of molecules per unit volume (nnn). However, because all molecules are moving (not just one), we add a factor of 2\sqrt{2}2 to account for the average relative velocity.，更多细节参见新收录的资料