名词短语
中文翻译：临界马赫数
同义词：
['critical Mach number', 'critical speed']
例句：
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1.The aircraft exceeded the critical Mach number and began to lose altitude.
飞机超过了临界马赫数，开始下降。
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2.The pilot had to make a critical decision about whether to continue or turn back.
飞行员不得不做出一个关键的决定，是继续前进还是回头。
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3.The rocket's performance was beyond critical, and it could not be controlled.
火箭的性能超出了临界状态，无法控制。