1. 宣布;宣告;公布
    If you announce something, you tell people about it publicly or officially.

    e.g. He will announce tonight that he is resigning from office...
           他將于今晚宣布辭職。
    e.g. She was planning to announce her engagement to Peter...
           她正計劃宣布她和彼得訂婚一事。

2. 大聲宣告，鄭重地說（尤指令人不快之事）
    If you announce a piece of news or an intention, especially something that people may not like, you say it loudly and clearly, so that everyone you are with can hear it.

    e.g. Peter announced that he had no intention of wasting his time at any university...
           彼得宣稱他無意在任何一所大學(xué)浪費時間。
    e.g. 'I'm having a bath and going to bed,' she announced, and left the room.
           “我要洗個澡然后上床睡覺，”她大聲說完便離開了房間。

3. （機場或火車站工作人員通過揚聲器）播報，通知
    If an airport or railway employee announces something, they tell the public about it by means of a loudspeaker system.

    e.g. Station staff announced the arrival of the train over the tannoy...
           車站工作人員通過廣播告知火車到站了。
    e.g. They announced his plane was delayed.
           廣播通知他所乘的航班晚點了。

4. （以信件、聲音、信號等）通知，告知
    If a letter, sound, or sign announces something, it informs people about it.

    e.g. The next letter announced the birth of another boy...
           下一封信通知又一個男孩出生了。
    e.g. His entrance was announced by a buzzer connected to the door.
           他剛一進(jìn)去，與門相連的門鈴便嗡嗡作響。

5. （仆人）通報，宣布（膳食備齊或來賓到達(dá)）
    If a meal or a guest is announced by a servant at a formal party, the servant says clearly that the meal is ready or the guest has arrived.

    e.g. Dinner was announced, and served.
           已宣布開飯了，菜都上齊了。