The second critical idea is Useful Life.
第二个要害性的概念是有用时间。
If you are food, do you foster useful life?
如果你是一颗粮食，你是否哺育了有用的生命？
During his useful life he often felt he was useless.
在他大有作为的一生中他老是感到自己无用。
During his useful life he often felt he was useless.
在他的生命中，他总是觉得他是没用的人。
During ghis useful life he often felt he was useless.
在他大有作为的一生中他老是感到自己无用。
Cant wiped off by alcohol, clear font, long useful life.
防酒精擦式，字体清晰不掉落，使用寿命长。
The march would consume half of the useful life of the vehicle.
此次长途跋涉将过于损耗车辆的寿命。
The march would consume half of the useful life of the vehicle .
此次长途跋涉将过于损耗车辆的寿命。
Susan began to believe that she would lead a useful life finally.
苏珊开始相信，她最终会成为一个有用的人生活下去。
Check the coalescing filter for replacement as it has a useful life.
检查更换过滤器，因为它凝聚了一个有用的生活。
Then, the system can be safely repaired and refactored throughout its useful life.
这样，系统即可在其有用的生命周期中安全地进行修复和重构。
Plant assets are relatively permanent, and have a useful life of more than 1 year.
固定资产相对是使用长久的，有用年限一般超过一年。
I thought it would be useful to include some humor tips for everyday life.
我觉得在日常生活中加入一些幽默技巧会很有用。
The Internet is very useful in our daily life.
互联网在我们的日常生活中非常实用。
Purify is a very useful tool throughout the software development life cycle.
Purify在软件开发生命周期中是一种非常有用的工具。
I want to do something useful with my life.
我想毕生做些有益的事。
So, they can all get what they think is useful to their college life.
因此，他们都可以得到他们认为自己是有用的大学生活。
Even the irritations of life can be useful.
即使生命的刺激也可能是有用的。
I find English very useful in my job and my everyday life.
我发现英语在我的工作和日常生活中都很有用。
In our daily life water has many useful ways.
在我们的日常生活中水有很多有用的方法。
Marx took English as a useful tool in the struggle of life.
马克思把英语当作人生斗争中的有用武器。
Do what you're told, then you can live a full, useful, and happy life.
按我们的话做，你会生活得又充实，又幸福的。
Of course, education should be useful, whatever your aim in life.
当然不是，不管你生活的目的是什么，教育总是应该有用的。
However, this report lives on as a very useful memorial to his life and experience.
然而，这一报告的生命作为一个非常有用的纪念他的生活和经验。
A washer or washing machine is quite useful in our daily life.
在日常生活中，洗衣机非常有用。
For once in your life make yourself useful.
去，去抓他，你一生至少也能干一件有用的事儿。
For once in your life make yourself useful.
去，去抓他，你一生至少也能干一件有用的事儿。
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