上能级寿命
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upper state lifetime
上态寿命
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A formula of energy storage in three-level system is deduced, which is different from the previous results in which the upper state lifetime is taken as the energy storage time.
推导了准三能级系统的储能公式。此公式与以前的结果不同，认为有效储能时间不等于上能级寿命。
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