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And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.
科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战
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The longest piece that I have been working on has been developed over the last three years.
我一直在写的一个最长的剧本已经写了三年了。
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And 50 or 100 years being an artist and working on your water colors, or whatever it is.
再用50或100年成为艺术家,研究水彩的运用等等。
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This is something we've been working for many, many years."
这是我们多年来努力的目标“
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In that year, we were early on in terms of diversifying the portfolio -we'd only been working on that program for two years -and even so,the negative return was less than 1%, so it was a modest negative return.
在那一年,我们还处于投资组合多元化的初期,刚刚开始2年,即便如此,股灾时我们的亏损小于1%,这只是一个轻微的亏损
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And I'm hoping once I graduate, to hopefully spend a couple of years working there.
而且我希望毕业以后，最好能在那里工作几年。
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I also served for the two years before that as the policy director of President Bush's presidential campain, working at the Texas.
在那之前，我做过两年的,布什总统选举的,政策主任，在德州工作。
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So biomedical engineers have been working for many years on how to design replacement parts for joints like the hip: the artificial hip is the most well developed of those.
因此,生物医学工程师花了很多年时间,致力于设计像髋关节这样的关节替代品,尤以人工髋关节的研究最为成熟
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I had been working at a public Accounting firm for a couple of years.
我在一家会计事务所已经工作了几年。
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and spent about two and a half years working with our brands
于是我在公司品牌方面花了两年半的时间，
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So working with her for 3 years,
所以在为她提供帮助的三年里，
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People have been working with x-rays for about 30 years by this time.
到现在为止,人类和X射线打交道大约30年了。
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This is something I've working on for many years and this will be it.
这是我多年努力的目标,这将会是。
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Like when they devised the first engines or the first nuclear reactors, it didn't work so well at first and then from the experience of many people working on it, over many years, a body of knowledge emerges and that's what we call technology.
这和发明出第一个发动机,或者第一个核反应堆时一样,最开始总是存在很多问题,但随着很多人不断努力去完善它,一种理论体系才得以不断发展,这就是我们所说的科技
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