Trump encouraged regional leaders gathered at his Miami-area golf club to take military action against drug trafficking cartels and transnational gangs that he says pose an “unacceptable threat” to the hemisphere’s national security.
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
Record syntax → positional constructors + accessor functions
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