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The hot air permitted higher speeds before the critical Mach number was exceeded.热空气可使之在超过临界马赫数之前达到更快的速度。The aim is to fly at about Mach 2, twice the speed of sound.目标是以大约2马赫的速度飞行，也就是音速的两倍。Empirical results are needed in...
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abbr.machine 机器，machinery 机器，machinist 机械师，machined 机械加工的...
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The hot air permitted higher speeds before the critical Mach number was exceeded.热空气可使之在超过临界马赫数之前达到更快的速度。The hot air permitted higher speeds before the critical Mach number was exceeded...热空气可使之在超过临界马赫数之前达到更快的速度。The aim ...