One of the reasons for the German preference for hop-on, hop-off high-speed trains is that stage lengths are shorter than in France, where the population is more spread out, with fewer big towns.
德国人喜欢随上随下高速列车的其中第一个原因是站与站的距离要比法国短，法国的人口更分散，大城市更少。
OPS still is placed in to study the stage because of lacking of the high-speed optical logic device and optical buffer.
光分组交换由于缺乏高速光逻辑器件、光缓冲存储器等，因此还处于研究阶段。
One of the reasons for the German preference for hop-on hop-off high-speed trains is that stage lengths are shorter than in France where the population is more spread out with fewer big towns.
德国人喜欢随上随下高速列车的其中第一个原因是站与站的距离要比法国短，法国的人口更分散，大城市更少。
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