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？
All this has happened because you couldn't be bothered to give me the message.
就是因为你嫌麻烦没通知我，才出了这事。
He thinks his heart is going to stop because he can't possibly know how this has happened.
他认为他的心脏要停止跳动了，因为他不可能知道这是怎么发生的。
然而这一切都没有发生。
This has happened in the past.
这种情况过去就曾发生过。
I regret that this has happened.
我为发生这事感到懊悔。
I'm so sorry this has happened to you.
你发生了这种事情，我感到很难过。
This has happened all over the world.
这样的事情发生在世界各地。
Of course, this is the second time this has happened.
当然，这已经是第二次发生iPhone原型机丢失的事情了。
Yet this has happened in other international examples.
这些在其它国际事务中也同样存在。
It wouldn't be the first time this has happened in the U.S..
类似案件已经不止一次在美国发生了。
This has happened in the past, and no doubt will continue to happen.
这在过去已经发生，而且毫无疑问将继续发生。
I can think of several examples in my career where this has happened.
我可以想出几个发生在我的职业生涯中例子。
This has happened on a large scale in at least Egypt, Syria and Libya.
至少在埃及、叙利亚和利比亚都大规模的发生。
"This has happened every month since 1996 and I've gotten used to it, " she said.
“自从1996后，这种情况每月都发生，我已经习惯了。”她说。
We're very embarrassed this has happened. We were shocked that this happened.
这起事件的发生让我们很尴尬，也很震惊。
We don't know the full details but it does seem bizarre that this has happened.
我们不知道全部的细节，但这件事的发生看起来很奇怪。
None of this has happened because businesspeople have suddenly become more immoral.
这种变化出现的原因并不是商人一夜之间就变得不道德。
This has happened three times to date, and in each case the drives were briskly located.
到目前为此，这种情况出现过三次，每次都能很很轻松地发现硬盘的位置。
He thinks his heart is going to stop because he cannot possibly image how this has happened.
他觉得心脏都要停止跳动了，他甚至不能相信这是怎么发生的。
This has happened at least a dozen times over the past few decades and it will probably happen again.
在近几十年，这样的事情已经发生了十多次了，而且将来可能还会继续发生。
All this has happened since August not in Kabul or Baghdad but in Monterrey in northern Mexico (see article).
这不是喀布尔，也不是巴格达，八月以来，这一切都发生在墨西哥北部的蒙特雷。
"This isn't the first time that this has happened," says Pastor William, who heads the burnt one-room church.
“这已不是第一次发生这样的事情了。”PastorWilliam朝着被烧毁的单间教堂说。
Don't worry if you do because this has happened all of us at least ones, for now enjoy these top 32 funny photos!
如果你是，不用担心，因为我们大家多少都对动物起过爱心。现在请对最有趣的32幅动物图片泛滥你的爱心！
Growth forecasts ended the year higher than at the start of the year, the first time this has happened since 2000.
2000年以来头一遭年末增长预测超过了年初。
Growth forecasts ended the year higher than at the start of the year, the first time this has happened since 2000.
2000年以来头一遭年末增长预测超过了年初。
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