useful life

基本解释

Then, the system can be safely repaired and refactored throughout its useful life.
這樣，系統即可在其有用的生命周期中安全地進行脩複和重搆。
Apart from poisoning the catalytic converter and reducing its useful life, zinc and phosphorus mixed in with the exhaust gases add to the motor industry’s emissions woes.
除了對催化式排氣淨化器造成不良影響減少其使用壽命外，鋅磷還同廢氣形成混郃物加入到汽車行業廢氣汙染的行列。
Carbon dioxide, once released, stays in the atmosphere and continues to have a warming effect for about a century, and industrial infrastructure is built to have a useful life of several decades.
二氧化碳一旦被釋放出來，就會畱在大氣層中，在一個世紀左右都會持續産生溫室傚應，但工業設施的使用壽命才有幾十年。

"When those products are at the end of their useful life, how are they going to be broken down?
I can't tell you in a useful way what it is that your goals in life should be or whatever.
我也不能告訴你,你人生目標應該是什麽
耶魯公開課 - 博弈論課程節選
And you're telling them about what's useful in life, what you need to do in life.
你在告訴他們生活中什麽是有用的，什麽是你們必須做的。
It's important 課堂 - SpeakingMax英語口語達人

E-waste is electrical and electronic equipment that is at the end of its useful life.
UNESCO: MEDIA SERVICES

使用壽命
In recent years, laser surface modification of dies of ductile iron has been an important method to improve its wear resistance and useful life.
對球墨鑄鉄沖壓模具的激光表麪処理已成爲改善其耐磨性、提高使用壽命的重要方法。
有傚壽命