无意中

They inadvertently got mixed up in a free fight involving some 20 people.

他们意中卷入了一场20 人左右的混战。

Walkers can unwittingly damage the fragile environment in which the birds live.

徒步旅行者意中破坏鸟类生活的脆弱环境。

I accidentally knocked the vase off the table.

我意中碰落了桌上的花瓶。

He accidentally knocked over an ink bottle.

他意中把墨水瓶打翻了。

Mary accidentally let out that her mother had telephoned.

玛丽意中说出她的母亲来过电话。

She probably dropped the parcel unawares.

她意中丢了那包裹。

The paper accidentally printed the victim’s address, then compounded their error by printing her name the next day.

意中刊出了受害者的地址，第二天又登出她的姓名，真是一错再错。

We happened on him unexpectedly.

我们意中碰见了他。

He accidentally triggered his rifle.

他意中扣发了他步枪的扳机。

While sitting in a coffee shop, we overheard a woman tearfully tell her husband that she was sorry that her work had been so consuming.

有一次我们坐在一个咖啡厅里，意中听到一名妇女正流着泪对她的丈夫说，她的工作总是那么地耗精费神，这使她歉疚。

I happened to see this thread, which said to be very horrible, and people not believing in supernature should not read, and threat of life sort of craps.

意中看到这样一个贴子，说什么极度恐怖，不信邪者慎入，还说什么有生命危险云云。