By contrast, the manned SR-71 Blackbird, used for many years by the U. S. Air Force, had a top speed of just more than Mach 3.
相比之下，载人的SR- 71黑鸟，供美国空军使用多年，有一个仅比3马赫以上的速度。
By contrast, the manned SR-71 Blackbird, used for many years by the U. S. Air Force, had a top speed of just more than Mach 3.
相比之下，载人的SR- 71黑鸟，供美国空军使用多年，有一个仅比3马赫以上的速度。
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