announce/ ə'nauns /

1.vt.[+decision] [ engagement etc] 
(declare) 宣布

The TV presenter announced the grave news.
电视解说员宣布了这条重大消息。
2.vt.
(at station or airport) 通告

3.vi.
(say) 说

"I'm going to bed," she announced.
我要睡觉了, 她说道。
to announce that...
宣布…
4.vi.
(at airport or station) 通告

the government has announced that...
政府宣称…