useful working life

基本解释

The technology can effectively monitor the useful life of lubricant and the working condition of equipments.
利用这种技术可以有效地监测润滑剂的使用寿命和设备工作状况。
Some researchers working to construct artificial life-forms out of mixtures of chemicals are also considering PNA as a useful ingredient for their designs.
以肽核酸为基础的药物可以通过结合到特定的核酸序列，抑制或者促进对应基因的表达。那些研究如何构建人造生命形式的研究者们也觉得肽核酸可能会是一种有用的材料，因为在生命起源的时候，遗传信息可能就是存放在肽核酸这样的原始遗传材料中。
Proper operating and maintenance of the lubrication and cooling system of R180 diesel engine can markedly prolong its useful life, and enhance its working efficiency.
正确地使用和维护R180柴油机润滑和冷却系统可以大大延长柴油机的使用寿命，提高工作效率。

He thought he had another 20 years or so of useful life, and was working on the 21st Aubrey novel.
ECONOMIST: Patrick O’Brian