issue a warning
collocation发出警告
The government issued a warning about the approaching storm.
政府就即将到来的风暴发出了警告。
警告；警示；告诫
警告；提醒；预告；预先通知；警告的实例；告知危险的信息；用于警告的言语或文字
a message, statement, or piece of advice that tells someone about danger or a problem
警告的实例
An instance of warning someone.
告知危险的信息
a message informing of danger
用于警告的言语或文字
Something spoken or written that is intended to warn.
关于即将发生之事(尤指危险或不快)的告诫性建议
cautionary advice about something imminent (especially imminent danger or other unpleasantness)
通常提前发出的通知
notification of something, usually in advance
The weather service issued a warning about the approaching storm.
气象部门发布了暴风雨即将来临的警告。
用法提示：warning 为名词，表示“警告、预警”，指提醒危险的消息。
AI contextual example
The teacher gave the student a warning about talking too much in class.
老师就那个学生在课堂上讲话太多向他提出了警告。
用法提示：warning 为名词，表示“告诫”，指提醒对方注意行为。
AI contextual example
Always read the warning on the label before using the device.
使用设备前一定要阅读标签上的警告。
用法提示：warning 为名词，表示“警示”，指物品上的安全提示。
AI contextual example
多用于紧急、突发情况，可作名词，语气比warning更紧迫
侧重于小心谨慎的提醒，常用在标识或告诫中，语气较温和
侧重正式的通知，不一定隐含危险，多指书面或口头预告
较正式，常指对错误行为的告诫，语气较重且带权威性
强调时间上的提前性，预示未来可能发生的危险
warning指危险即将来临的警告，all clear指危险已解除或安全的信号
warning提醒潜在危险，green light表示许可或允许继续进行
发出警告
The government issued a warning about the approaching storm.
政府就即将到来的风暴发出了警告。
作为警告
This accident should serve as a warning to all drivers.
这起事故应作为对所有司机的警告。
早期预警
The radar system provides early warning of incoming missiles.
雷达系统提供来袭导弹的早期预警。
警告标志；预兆
Red spots on the skin are a warning sign of an allergic reaction.
皮肤上的红斑是过敏反应的警告信号。
毫无征兆地
The earthquake struck without warning in the middle of the night.
地震在深夜毫无征兆地发生了。
事先警告
I gave you fair warning that the price would go up.
我事先警告过你价格会上涨。
warn (verb root) + -ing (suffix)
警告的标志；预兆
The dark clouds were a warning sign of an approaching storm.
乌云是暴风雨即将来临的预兆。
警告性的枪声；警告性举措
The company's layoffs were a warning shot to the remaining employees.
公司的裁员是对剩余员工的一个警告。
毫无预警地
The earthquake struck without warning, causing widespread damage.
地震毫无预警地发生，造成了大面积破坏。
警告：蛋糕是谎言。
From the video game Portal.
来自电子游戏《传送门》。
警告：你正在进入一个玩家对战区域。
Common message in the online game World of Warcraft.
在线游戏《魔兽世界》中的常见提示。
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Dictionary facts from ECDICT, WIKTIONARY.