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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. 1970年夏天，有三路兵马征战超音速运输机领域，俄罗斯的图-144、仍然在设计阶段的波音2707-300以及协和超音速客机。