to officially tell people about something, especially about a plan or a decision

宣布，宣告，公布:

They announced their engagement in 'The Times'.

他们在《泰晤士报》上宣布了订婚的消息。

The government has announced plans to create 10,000 new jobs.

政府宣布了创造一万个就业机会的方案。

A government spokesman announced that the hostages had been released.

政府发言人宣布人质已经被释放。

At the end of their meeting, it was announced that an agreement had been reached.

会议最后宣布已达成一项协议。

Cordon announced his resignation to staff members on Wednesday.

星期三，科登向员工宣布辞职。

to say something, especially something that other people will not like, in a loud and confident way

郑重地说，大声而肯定地说〔尤指别人不喜欢的事〕;

'I'm not going to their party,' Maggie announced.

“我不去参加他们的聚会。”玛吉郑重地说。

He stood up and announced that he was ready to go.

他站起身，肯定地说要走了。

to give information to people using a loudspeaker or microphone, especially at an airport or railway station

〔尤指在机场或火车站的〕广播通知:

We arrived just as they were announcing the arrival of Flight 207 from Minneapolis.

我们到的时候正在广播来自明尼阿波利斯的 207 次航班已经到达的消息。

announce sb / yourself, to officially tell people that someone has arrived at a particular place

通报某人/自己的到来:

All visitors to the apartment building must be announced.

那幢公寓楼的访客必须全部通报。

After announcing himself at the reception desk, James was led upstairs.

在接待处通报姓名后，詹姆斯被领上楼去。

to introduce a programme on television or radio

〔在电视台或电台〕当…的播音员（节目主持人）