Some internet-driven changes have happened quickly, of course.
当然，一些互联网驱动的变化很快就发生了。
We mustn't forget the plants, without whose prior invasion of the land none of the other migrations could have happened.
我们不能把植物给忘了，没有它们事先入侵陆地，就不会有其他的迁徙发生。
None of this would have happened if you'd listened to me.
你要是听了我的话，这一切就不会发生了。
It's tempting to speculate about what might have happened.
大家不禁猜测，到底发生了什么事。
If we had been spotted at that point, I don't know what would have happened to us.
如果那时我们被发现了，我不知道我们会有什么后果。
Here, we'll take a look at a few of the most important events that have happened.
来，我们来看看发生的一些重要事件。
If the new safety system had been put to use, the accident would never have happened.
如果采用了新的安全系统，事故就不会发生了。
Heidi, knowing that something must have happened, followed him.
海蒂知道一定是发生了什么事，就跟着他。
It would never have happened if he had stayed in Australia, for Australia is still the land of the bungalow.
如果他留在澳大利亚，这一切都不会发生，因为澳大利亚仍然是平房之地。
As Dr. Davies reports in the Public Library of Science, that is not what seems to have happened with at least one piscine antifreeze gene.
正如戴维斯博士在《公共科学图书馆》上发表的报告所述，至少有一种鱼的抗冻基因似乎并不是这样的。
They also argued that measures of productivity ignore what would have happened without investments in IT—productivity gains might have been even lower.
他们还认为，生产率的衡量忽略了如果没有对IT 进行投资会发生的情况：生产率的增长可能更低。
The notion is that people have failed to detect the massive changes which have happened in the ocean because they have been looking back only a relatively short time into the past.
这种观点认为，人们之所以没有察觉到海洋中发生的巨大变化，是因为他们用于回顾过去的时间相对较短。
But stranger things have happened.
但是更加奇怪的事情已经发生了。
So, No, it shouldn't have happened!
所以，不，这本来是不应该发生的。
Now it seems to have happened.
眼下看来已经应验了。
One of two things may have happened.
可能有两件事情会发生。
Instead, two things have happened.
恰恰相反，发生了两件事。
Similar things have happened elsewhere.
其他地方也发生了类似的情况。
That does not seem to have happened.
这种现象似乎并未发生。
But it could've have happened like that.
但我也本有可能会死。
But how, I wondered, could this have happened?
可旅馆餐厅怎么会出这种事呢？
That wouldn't have happened if we weren't bloggers.
如果我们都不写博客，这一切都不可能发生。
Yet after years，many things have happened to me.
又过些年，我自己，发生了很多事。
Yet after years, many things have happened to me.
又过些年，我自己，发生了很多事。
Something similar appears to have happened at Disney.
类似事件也同样发生在迪斯尼身上。
But three things have happened in the past few months.
但是过去几个月发生了三件事。
What changes have happened in China in these ten years?
这十年我们中国发生了什么样的变化呢？
What changes have happened in China in these ten years?
这十年我们中国发生了什么样的变化呢？
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