The Mach eases to 3.5 as we crest 80,000 feet.

随着速度达到3.5马赫，我们也攀升到80000英尺的极限高度。

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It shows the indicated airspeed and the Mach number.

它显示了飞行速度和马赫数。

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You can do a lot on OS X without getting down to the Mach layer.

你可以在OS X上做很多事而不需要深入到Mach层。

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As a consequence, the D8.1 would cruise at Mach 0.72 (seven-tenths of the speed of sound) and the D8.5 at Mach 0.74, compared with about Mach 0.79 for a B737-800.

ECONOMIST: The aircraft of the future

For the few who don't know, Yeager's the first human to fly above Mach 1, the speed of sound.

CNN: Where planes go to die

After separating from the booster, the scramjet engine was ignited, accelerating the aircraft to Mach 5.1 at 60, 000 feet.

NPR: Experimental Air Force Aircraft Goes Hypersonic