实际寿命 meaning in English

actual lifetime
physical life
practical life

The life actually required for bearings naturally varies according to the nature of the application .
轴承所需的实际寿命当然与应用的性质有关。
The predicted life by using the two new methods and the observed life are compared for a notched shaft . the results showed that the presented new methods are reasonable
利用本文提出的寿命预测模型，对缺口件的寿命进行了计算并和实际寿命进行了比较，结果表明该模型是合适的。