(the idea can arguably be traced back as far as the Hanging Gardens of Babylon, built around 600bc.) So far, however, the idea remains firmly on the drawing board.
(这个想法无疑可以追溯至公元前600年左右建造的巴比伦空中花园)然而，到目前为止，这个想法仍然停留在绘图板上。
The first drawing is of the Akron design as planned. The main difference between it and the final ship as built is the tail fin design.
阿克伦号的初步设计按计划完成，与实物仅仅在尾鳍的设计有区别。
The first drawing is of the Akron design as planned. The main difference between it and the final ship as built is the tail fin design.
阿克伦号的初步设计按计划完成，与实物仅仅在尾鳍的设计有区别。
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