我确信这曾经发生过。
在这之前发生了什么？
You do not understand the story, the background, what happened before, and what happens next.
你不了解这个故事、其背景、之前发生了什么以及接下来会发生什么。
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？
Their smile and gentle manner moved me in a way that never happened before .
他们的笑容和礼貌的举止前所未有地感动了我。
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。
以前从不曾发生这种事情。
Happened before and I survived.
这以前发生过，而我幸存了下来。
这种情况以前发生过吗？
It has, after all, happened before.
毕竟，这些都发生了。
这种变幻以前曾经发生过。
这在以前就发生过。
Has this happened before with this guy?
这个家伙以前出现过这种情况吗？
It has never happened before. We have no explanation.
以前从未发生，我们无法解释。
Things that happened before the poor boy was born.
可怜的孩子出生前的事儿。
But it's happened before, and the Internet is still here.
但同样的事情以前发生过，而且因特网通过了考验，仍然完好无缺。
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。
This has never happened before, at least not in moderntimes.
此前，这从未——至少在现代——发生过。
It's not taking place in this life, so it has to have happened before.
既然不是这辈子发生的，那么就肯定是以前发生的。
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 ？ ？
This is unnatural. It has never happened before. We have no explanation.
这是反常的。以前从未发生，我们无法解释。
"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。”
Most injuries to non-pitchers also happened before the all-star break.
大部分非投手受伤也发生在全明星赛之前。
That night, Liu failed to come home, something that had never happened before.
那天晚上，刘没有回家，这种事情在以前是从没有发生过的。
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。
But a compromise candidate could yet slip through the middle, as has happened before.
不过也有可能会像以前发生的那样，一个折中的候选人会从中脱颖而出。
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。
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。
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