动词警告；告诫；提醒注意（可能发生的事）；使警惕网络预先通知；警戒；警告信息
及物动词
2. The whistle warned visitors that the ship was ready to sail.
汽笛通知旅客船即将启航。
3. He warned me against going outside alone at night.
他提醒我晚上不要单独出去。
4. The weather station warned that a hurricane was coming.
气象台预报飓风即将来临。
5. warn在线翻译
5. The police warned us not to go out at night.
警察告诫我们夜间不要出门。