translation.en: If we'd evolved in a vacuum, we would expect them to hit the ground simultaneously. If we were bacteria, constantly buffeted by thermal movements of molecules, it would be different.
translation.zh: 但假设我们是在真空的环境中进化的话，我们可以预料 到它们会同时落地。如果我们是细菌的话， 是会持续不断地受到分子间的热作用的冲击的 那将会和我们现在的情况大不相同。