In the summer of 1970, the SST race was three-way, with Russia's Tu-144 and the still-on-the-drawing-boards Boeing 2707-300 joining the legendary Concorde.
Instead they've become models of bold visions that mostly stayed on the drawingboards - or collapsed from shoddy implementation.
但它们变成了图纸上的大胆想象的典范——或者毁于低劣的执行。
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Megaprojects like those now coming off the drawingboards require large Numbers of experienced engineers, skilled workers and architects, as well as specialized equipment.