We have what at first seems like a pretty attractive theory, but then, how do you explain the fact that this has happened before?
我们提出了一开始看起来很有吸引力的理论，但是接下来，你要如何解释以前也发生过这种情况呢？
Some people believe whatever has happened before or is happening now will repeat itself in the future.
有些人相信过去发生或现在发生的一切将来都会重演。
Happened before and I survived.
这以前发生过，而我幸存了下来。
这种变幻以前曾经发生过。
We know this, Keith says, because it’s happened before.
基思说，我们了解这种情况，因为以前就发生过。
How do you stop this from happening and why hasn't it happened before?
如何制止这种事情发生？为什么这种事以前没有发生why hasn ' tit happened before ？ ？
"Historically it has happened before," the former United player said.
这位前曼联球员说：“历史上这样的事情也发生过，球队因此而获益。”
It also connects the web and the world in ways that have never happened before.
移动先行体验还以一种全新的方式把网络和世界连在一起。
What we're suggesting is the declines happened before the Clovis toolkit was adopted.
但是我们认为猛犸数目的减少发生在克洛维斯人应用他们的工具之前。
Whatever happens in the stock market to-day has happened before and willhappen again.
股市里所有今天发生的事在过去已经发生过，而且还将会发生。
Daughter: the teacher keeps asking me about the things that happened before I was born!
女儿：历史老师老讲些我还没出世前的事！
And that got me to thinking: What if there were no Fed? Don't laugh; it has happened before.
让我思考的是，如果没有美联储会怎样，别笑，之前这种情况已经发生过。
That has happened before, but typically when the markets are strong and IPOs are flooding out.
这在以前也发生过，但一般是在市场走势强劲，IPO纷纷出笼的时候。
Regardless of what happened before, the person bringing up the past is feeling something similar now.
不论过去发生了什么，提起它的人是在目前受到了与过去相似的感觉。
Whatever happens in the stock market to-day has happened before and will happen again. I've never forgotten that.
在股票市场过去发生的事情在以后还是会在发生的，这个规律我永远也忘不了。
Which was very weird, as this had never happened before, and the kitchen is where I kept their food and water.
这也很不寻常，因为之前这种事从没发生过，而且狗粮和水也是放在那儿的。
Thus christened, my old identity began to fade, much as a baby will not remember all that happened before it is born.
就这样，我受了洗礼，以前的身份开始磨灭，所剩下的不会比一个婴儿所能记得的他出生前的事情更多。
The things you encountered today appeared to have happened before, only the trivial details were somewhat different.
你今天遇到的事情，从前好像已经遭遇过了，只是细枝末节有点不同罢了。
She appeared a year on from her assault by boyfriend Chris Brown, which happened before last year's Grammy ceremony.
在去年格莱美奖典礼上遭男友ChrisBrown袭击的一年之后，她再度出场。
Sade sings as if there are plenty of reasons to leave, and as if this conversation has happened before, maybe many times.
沙黛唱得好像有千百种离去的理由，好像这样的对话曾经发生过，也许发生过许多次。
In the advertising, there is only one sentence, “The newspaper records what happened before it print. For what is happening now.
在这广告中，空白的背景上只有一句话，“这份报纸记录印刷前发生的事。
Nobody was really sure what happens if you answer the hardest question he can come up with because it's never happened before.
如果我答起了他最刁钻的问题，没有人会确定会发生什么，因为这以前就没发生过。
"I'm not saying this isn't going to take some new infrastructure," he says. "But it 's happened before, and the Internet is still here."
他说：“我并不是说这不需要采用新的基础设施，只是以前同样的问题出现时，因特网照样在运行。”
Changes in virulence have certainly happened before in influenza epidemics, which have struck in successive waves of different severity.
在以前的地方流感流行中，病毒的毒性确实有改变过的历史。 变化后的病毒以不同的毒性在接下来的时间不断地袭击过人类。
One day my watch told me I had been going for 60 minutes, which had never happened before. I ran another 12 minutes and got my first runner's high.
有一天我发现我可以跑60分钟了，这以前从来没有发生过，我又跑了12分钟，达到了我的一个新高度。
Except that unlike before, we don't have the convenient and simple cancellation of the factorials. That happened before, because they were there.
除了和以前不一样的一点，我们没有方便，简单的阶乘的相消,这在以前发生过，因为它们存在。
Except that unlike before, we don't have the convenient and simple cancellation of the factorials. That happened before, because they were there.
除了和以前不一样的一点，我们没有方便，简单的阶乘的相消,这在以前发生过，因为它们存在。
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