to announce

• 宣布开会

  call a meeting to order

• 宣布散会

  dismiss a meeting

• 宣布开学日期

  announce the date when school begins

• 宣布独立

  declare independence

• 宣布大赦

  announce a general amnesty

• 宣布条约无效

  declare a treaty null and void

• 宣布选举无效

  declare the election results invalid

• 宣布宵禁

  declare a curfew