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单语范例（未经PONS编辑处理）
At burn-out the altitude was 150,000 feet (45.7 km) and the Mach number was 2.5.
en.wikipedia.org The speed brakes were not damaged and succeeded in reducing the Mach number.
en.wikipedia.org The top-right boundary of the envelope is the curve representing critical Mach number in true airspeed terms, which decreases as altitude increases.
en.wikipedia.org A Mach number of 1.0 indicates an airspeed equal to the speed of sound in that air.
en.wikipedia.org Interestingly, the intersection points occur at the given initial Mach number and its post-normal shock value.
en.wikipedia.org