The problem is that these gases have a long life time in the atmosphere.

问题是，这些气体在大气中有很长时间的寿命。

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With high photoelectric rate. The diode side-pump laser source is good stability and long life time.

电光转换效率更高，功耗低，输出激光能量稳定。半导体侧面泵浦激光器使用寿命更长。

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This article was based on the project "research on the joints that hold long life time and high quality".

本文课题内容来源于总装备部十一五装备预先研究计划项目《长寿命机械连接与高性能紧固件技术研究》。

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He wrote a book about the final years in the political life of a long-time mayor of Boston,Massachusetts.

VOA: special.2010.04.11

Yeah it goes back to a long time in my life, but most immediately to my own graduate career, which I went to several different schools.

这说来话长了，就近而言，这跟我所任职的研究生院有关，我在不同的大学任职。

普林斯顿公开课 - 人性课程节选

but in that time, I'm hoping to set up my life such that one day, in the long term,

但长期以来，我希望有一天能够掌握自己的生活，

事业和人生都重要 - SpeakingMax英语口语达人

And it will be a long time before life goes back to normal.

WHITEHOUSE: Weekly Address: Wishing the American People a Happy Thanksgiving | The White House

Driven to live long enough so that her kids would remember their mother, Giusti embarked on her life-long mission to buy time, and in so doing, she came to some sobering realizations.

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And it isn't really new because she's been the first lady in my life for a long time.

CNN: Election Night Victory Speech