Tā / men / duǒ / dào / huì / yì / shì / lǐ / mì / tán / shuí / yě / bù / zhī / dào / tán / le / shén / me

他们躲到会议室里密谈，谁也不知道谈了什么。

They went into a meeting room for a secret discussion, and no one knew what they talked about.