- life formula
- 寿命: life-span; life; age; lifeti ...
- 计算: count; compute; calculate; r ...
- 公式: formula; expression
- 使用寿命计算: lebensdauerberechnung durability calculation
- 计算公式: calculationformula; computational formula; computing formula; design formulas; formula of computation; kellicutt
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