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...
           他将于今晚宣布辞职。
    e.g. She was planning to announce her engagement to Peter...
           她正计划宣布她和彼得订婚一事。

2. 大声宣告，郑重地说（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...
           彼得宣称他无意在任何一所大学浪费时间。
    e.g. 'I'm having a bath and going to bed,' she announced, and left the room.
           “我要洗个澡然后上床睡觉，”她大声说完便离开了房间。

3. （机场或火车站工作人员通过扬声器）播报，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...
           车站工作人员通过广播告知火车到站了。
    e.g. They announced his plane was delayed.
           广播通知他所乘的航班晚点了。

4. （以信件、声音、信号等）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...
           下一封信通知又一个男孩出生了。
    e.g. His entrance was announced by a buzzer connected to the door.
           他刚一进去，与门相连的门铃便嗡嗡作响。

5. （仆人）通报，宣布（膳食备齐或来宾到达）
    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.
           已宣布开饭了，菜都上齐了。