주어진 문장: This discovery suggested what the archivist called the 'dual-clock hypothesis'.
Two travel diaries seemed to place the same ship in different ports at the same clock time on the same date. [A] Historians initially suspected that one traveller had reconstructed the journey inaccurately. [B] An archivist then found that one port recorded arrivals by local solar time, whereas the other had already adopted a regional railway clock. [C] This hypothesis was tested by converting both entries to the same standard, which showed that the ship could have completed the crossing between them. [D] The diaries were retained, but the catalogue now explains the different conventions under which their dates were recorded. [E]