讨论变得离题，失去了焦点。

The discussion became tangential and lost focus.

这本书的焦点是环境保护。

The focus of this book is environmental protection.

他们决定变窄讨论的焦点。

They decided to narrow down the focus of the discussion.

她的演讲成为了整个活动的焦点。

Her speech became the focus of the entire event.

他在演讲中成为了追光的焦点。

He became the focus of the spotlight during his speech.