Three years ago, when the clean-up started, garbage was everywhere, but this year, the teenagers had to hunt for garbage.
三年前，当清理工作刚开始时，垃圾随处可见；但今年，青少年们不得不主动去寻找垃圾。
I first encountered DFA several years ago when I worked on regular expressions, but it has been at least three years since I last used them so I spent some time researching the subject.
几年前，我在处理正则表达式时，第一次遇到了DFA，但是我已经至少有三年没有用过它，所以我花了一些时间来研究它。
Robbie Turner: Yes but, if all we have, rests on a few moments in a library three and a half years ago then I am not sure, I dont know...
罗比：对，可是，如果我们所有的一切只剩下三年半前书房的那一刻，那么我不能肯定，我不知道……
It is difficult to criticise the American, who has invested heavily since he took control three years ago, but if the club are to compete at the top then big money needs to be made available again.
很难去批评这个美国人，在他三年前接手维拉时，他已投入了大笔资金。
It started its solar enterprise three years ago but that now accounts for half of its business.
DEK三年前开始涉足太阳能行业，现在该行业已经占到业务量的一半。
It WAS only three years ago, but it feels as though aeons have passed.
不过只是三年前，但是感觉好像已经过了几十亿年。
They moved to the area from London three years ago, but they still fell like outsider.
他们三年前从伦敦搬入这个地方，单现在他们仍然感到自己像外人。
"Three years ago, I would say that money is the most important thing to me but now, family is," he said.
他表示：“三年前，我会说钱对我而言是最重要的东西，但是如今，家庭才是最重要的。”
Two or three years ago we could go into certain games and say we'd probably pick up three points, but we can't do that any more. We just have to keep our focus.
在英超，没有任何理所当然的事情，两三年前我们还可能认为某些比赛能够轻而易举的拿到三分，但是我们再不能那样了，我们要一直保持我们的注意力。
Embryos from cattle cloned in the US were first imported three years ago, but no official checks have been kept on their offspring.
三年前，英国从美国首次进口了克隆牛的胚胎，但并无官方组织对这些克隆牛的后代进行持续检测。
But overseas orders took off three years ago, after energy prices began rising.
但在三年前能源价格上涨后海外订单开始增多。
On his first trip three years ago Mr Zhu filled a whole notebook with orders and was surprised that Africans not only wanted to trade with him but also enjoyed his company.
三年前朱先生第一次来到非洲，当时他的笔记本上写满了订单，令他惊奇的不仅仅是人们愿意和他做生意，而且人们很喜欢他的公司。
But loosening underwriting standards now to recapture market share lost three years ago is a risky approach.
但是现在放松贷款标准去重占三年前失去的市场是一件危险的做法。
Three years ago a group of researchers asserted that dogs could do the same, using a similar experiment, but with a dog watching another dog using its PAWS or mouth to manipulate a handle.
三年前，一个研究小组断言犬类也会这么做，他们进行了类似的实验，不过是让一条狗观察另一条狗用它的爪子或者嘴巴去操纵一个把手。
We are clearly much better prepared than three years ago, but have every reason to continue these efforts.
我们的防范明显好于过去三年，但必须继续努力。
The slopes surrounding the village were cloaked with three glaciers 30 years ago, but villagers say that over the past decade the glaciers have vanished, leaving nothing but bare rock.
在三十年前，环绕着这个山谷的坡是三个冰川，但是居民们说，在过去的十年间，冰川消失了，除了光秃秃的岩石，什么也没有剩下。
Then, around 1.8 million years ago, not one but two or possibly even three Homo species appear, mostly in East Africa.
接着，在大约180万年前，不是一种人属，而是两种、甚至可能有三种人属出现了，它们大多数分布在非洲东部。
"I don't think Comes With Music would have been licensed three years ago," says Mulligan. "But the record labels understand that [digital sales to iPods] isn't enough."
穆里甘说：“我不认为ComesWithMusic计划在三年前会得到唱片公司的许可，但唱片公司们明白不能吊死在iPod一棵树上。”
That was down 8% from three months earlier, but still almost triple the $5.5 trillion level of three years ago.
这个数字较3个月前的水平下降了8%，不过仍比3年前5.5万亿美元的水平高出了近两倍。
But although these DB2 releases became generally available more than three years ago, many users still seem confused regarding the purpose and advantages of roles and trusted contexts.
但是，尽管这些DB2版本比3年前应用更加广泛，但许多用户仍然没弄明白角色和可信上下文的用途和优点。
That simple but vital question has dogged the microblogging service since its birth three years ago.
自从3年前这个微型博客服务诞生之际，这个简单而又重要的问题就一直挥之不去。
But in fact most of us have just two people we would consider to be close friends - down from an average of three 25 years ago, a study claims.
然而有研究称，事实上我们中的大多数人只有两个亲密的朋友，而25年前人均好友数量为3个。
New Orleans faced its first threat of serious flooding since Hurricane Katrina struck three years ago, but Gustav just missed the city.
自3年前飓风卡特里娜袭击以来，新奥尔良首次面临洪灾威胁，但古斯塔夫飓风并未在此城登陆。
But it is hard to explain the recent weakness of the dollar in this way, since the deficit is lower than it was three years ago.
但是很难解释美元这样的疲软状态，因为赤字低于3年前。
But it is hard to explain the recent weakness of the dollar in this way, since the deficit is lower than it was three years ago.
但是很难解释美元这样的疲软状态，因为赤字低于3年前。
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