1、operation

（由大量人員參與、具有高度組織性的）活動，行動，工作

The rescue operation began on Friday afternoon.

救援行動于星期五下午開始。

The soldiers were engaged in a military operation close to the Ugandan border.

這些士兵參加了烏干達邊境附近的一次軍事行動。

企業；公司

Thorn's electronics operation employs around 5,000 people.

索恩的電子公司雇用了約5,000名員工。

The two parent groups now run their business as a single combined operation.

這兩個母公司現在合并為一家企業經營業務。

使用；運作

Until the rail links are in operation, passengers can only travel through the tunnel by coach.

在鐵路連線開通之前，乘客只能乘坐長途客車穿越隧道。

the free banking system that has been in operation since the early eighties.

從80年代初就開始實行的自由銀行制度

2、vital

必要的;至關重要的;必不可少的

The port is vital to supply relief to millions of drought victims.

這個港口對向數百萬旱災災民提供救援物資是至關重要的。

Nick Wileman is a school caretaker so it is vital that he gets on well with young people.

尼克·威爾曼是學校的管理員，因此與年輕人搞好關系很重要。

充滿活力的;生氣勃勃的

They are both very vital people and a good match.

他倆都很有活力，十分般配。

They have something important to say and vital and radical ways of saying it.

他們有些重要的事情要說，言辭會比較激烈。