High frequency switching power supply adopting soft switching technology, which has reliable high efficiency and long use time performances becomes the important part of DC power system.

基于软开关技术的高频开关电源因其性能可靠、效率高、寿命长等优点，成为了现代电力操作电源系统中的重要组成部分。

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We need a long time practice to learn how to use the scissors and how to paint.

我们需要长时间的练习来学习如何使用剪刀和如何画画。

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Though "easy" may be welcome, unluckily it's of little use for any long time development of reading skills and the general language level.

虽然“简单”可能是受欢迎的，但不幸的是，它对长期发展阅读技能和一般语言水平几乎没有用处。

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Congress will take its annual long recess in August, and Democrats hope to use the time to build support for health-care reform around the country.

VOA: standard.2009.07.31

Research on subjective wellbeing-- the term that psychologists use to capture happiness essentially has been going on for very, very long time.

对幸福的研究-,心理学家用这个词来描述快乐,已经进行了很多年。

哈佛公开课 - 幸福课课程节选

Stocks have a long shelf life, too, and we buy them in order to use them a long time in the future.

FORBES: The Tuna Fish Factor And Stocks

Of course, since cell phones have been in use for a relatively short time, we cannot rule out the possibility that heavy and long-term use may prove to have effects when more time has elapsed.

FORBES: Do Cell Phones Cause Brain Cancer? The Diehards Cling Desperately To Opinion

But it's also possible that long-term use of Tysabri alone is also dangerous when given for a long time.

FORBES: Tysabri Is No Vioxx