translation.en: These tables were calculated using a fixed procedure over and over by part-time workers known as -- and this is amazing -- computers, but these calculations were really difficult.
translation.zh: 这些表格都是由一些临时工—— 被称作“人工计算机”—— 依据固定的计算过程一遍一遍算出来的， 但是这些计算真的很复杂。