announce

v. 发表,广播（电台节目）,通告,正式宣布
vi. 当电台的播音员
vt. 宣布,宣告

The news was announced by Radio Beijing.

这条消息是由北京广播电台播发的。

Everyone was silent as he announced the winner of the competition.

当他宣布竞赛的优胜者时，大家都静静地倾听。