Such speed of travel was unimaginable before the railway age.
这样
车速在铁路时代之前是
想像。
能想象
；
想象；想到能考虑, 能接受, 
想像, 置信;
;思议;置信;, 无前例;,使人惊骇;怕;;，广大;怕;;Such speed of travel was unimaginable before the railway age.
这样车速在铁路时代之前是想像。
We all believed it unimaginable that he had lived alone on a deserted island for so long.
我们都觉得他在渺无人迹荒岛上住这么久是想象。
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