1、operation

（由大量人员参与、具有高度组织性的）活动，行动，工作

The rescue operation began on Friday afternoon.

救援行动于星期五下午开始。

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

这些士兵参加了乌干达边境附近的一次军事行动。

企业；公司

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

索恩的电子公司雇用了约5,000名员工。

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

这两个母公司现在合并为一家企业经营业务。

使用；运作

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

在铁路连线开通之前，乘客只能乘坐长途客车穿越隧道。

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

从80年代初就开始实行的自由银行制度

2、vital

必要的;至关重要的;必不可少的

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

这个港口对向数百万旱灾灾民提供救援物资是至关重要的。

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

尼克·威尔曼是学校的管理员，因此与年轻人搞好关系很重要。

充满活力的;生气勃勃的

They are both very vital people and a good match.

他俩都很有活力，十分般配。

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

他们有些重要的事情要说，言辞会比较激烈。