动词 happen:

1. come to pass

2. happen, occur, or be the case in the course of events or by chance (Santayana)

3. chance to be or do something, without intention or causation

4. come into being; become reality

5. come upon, as if by accident; meet with

Mechanization happened years ago on the farms of Islay.

数年前，艾莱的农场就实现了机械化。

Her son used sign language to tell her what happened.

她儿子用手语告诉她发生了什么事。

Elaborate efforts were made to reconstruct what had happened.

为重现当时的情景，他们做了大量细致的工作。

An investigation is underway to find out how the disaster happened.

调查已经展开，以查明灾难是如何发生的。

He gave a detailed account of what happened on the fateful night.

他详细描述了那个灾难性夜晚所发生的事。

'What's happened to her?' 'u2014 'I'm sure she won't be long.'

“她怎么回事？”——“我相信她快到了。”

I remember now. He arrived just at the moment it happened.

现在我想起来了，他恰恰在事情发生的时候到了。

Try to keep calm and just tell me what happened.

镇静点，告诉我出了什么事。

Now, in your own time, tell me what happened.

现在慢慢告诉我发生了什么事。

He said it was true that a collision had happened.

他说真的发生了冲突。

It really is desperately unfortunate that this should have happened just now.

刚才竟发生这样的事儿，实在是太不合时宜了。

I happened to bump into Mervyn Johns in the hallway.

我在走廊里意外碰见了默文·约翰斯。

I felt a little bump and I knew instantly what had happened.

我感觉到一点儿轻微的碰撞，便立刻意识到发生了什么。

Some people have left out of embarrassment at what's happened to them.

一些人已经由于为发生在自己身上的事感到难堪而离开了。

If Daniel asks what happened in court we will tell him.

如果丹尼尔问起庭审情况，我们会告诉他。