But there are different accounts about how this happened.

但对于这次事件如何发生也有不同的言论。

These changes weren't happening in a vacuum.

这些改变并不是凭空出的。

And the long-sought holy grail of ubiquitous voice recognition really will eventually happen.

们长期以来向往无所不的语音识别最终将成为实。

That's thought to have happened after breakup of the Soviet Union.

据了解，自从苏联解体之后，这类交易就开始了。

Human flow has always happens in human history.

口流动是类历史上经常发生的事。

So it's clear that something has happened there.

因此，那里显然进行了军事行动。

The FBI is helping investigate how this happened.

美国联邦调查局正就此次袭击展开调查。

Then about seven million years ago something major happened.

接着，大约700万前，某种具有决定意义的事情发生了。

It's been almost a year since that happened.

那起火灾差不多过了一的时间。

The Dow plunged 22.6 percent. It had never happened before.

当天，道琼斯指数下跌22.6%。这种情况以前从未发生过。

What happened to you this morning? What happened in Kathmandu?

今天早上发生了什么？加德满都发生了什么？

It's unclear what may have happened to the pilot.

目前尚不清楚飞行员的状况。

The plane was returning to base when the accident happened.

事故发生时，这架飞机正准备返回基地。

Do you realize what could have happened to your son?

你意识到你的儿子会怎样吗？

But he is saddened that the connection could not happen sooner.

但令他难过的是，这样的和解不能早点发生。

Or it might seem like nothing's happened.

或者可能会感觉完全无事发生。

Mr. Biden and his wife were out when the incident happened.

拜登及妻子案发时没有家中。

This is a nuclear option. It's never actually happened before.

这是一个核选项。此前从未发生过这种事。

What just happened? - You're stupid. That's what just happened.

刚才怎么回事？- 你是个蠢货，就是这么回事。

And I know that things don't just happen.

我知道好事不会随随便便发生。