名词
中文翻译：降落伞指数
同义词：
['parachute index', 'parachute indexrate']
例句：
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1. The parachute index is a measure of howwell an aircraft can handle a sudden dropin altitude.
降落伞指数是衡量飞机在突然下降高度时能否良好应对的指标。
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2. The parachute index has beendeclining steadily over the past decade, indicating that the planes are notas safe as they once were.
过去十年里，降落伞指数一直在稳步下降，这表明飞机的安全性不如以前了。
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3. The parachute index is used by pilotsto determine the best time to ejectpassengers during a crash.
飞行员使用降落伞指数来确定在坠机事故中乘客最合适的逃生时间。