无意中的

Mary accidentally let out that her mother had telephoned.

玛丽无意中说出她来过电话。

I accidentally knocked the vase off the table.

我无意中碰落了桌上花瓶。

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

徒步旅行者可能无意中破坏类生活脆弱环境。