One might think that this was enough, but in September, a fourth paper arrived as a "by the way" follow-up to the special relativity paper.
어떤 사람은 이정도면 충분하다고 생각하겠지만, 9월에, 네번째 논문이 특별한 상대성 원리의  후속조치"그건 그렇고" 로써 나왔죠.