be on alert for sth
The army is on alert for any possible attack.
军队对任何可能的袭击保持警觉。
警报；警告
alerts — plural of alert
警觉；戒备；重要通知；警示通知；响铃字符；高度警觉或准备行动的状态
A warning or alarm that tells people about danger.
警报。
An alarm.
高度警觉或准备行动的状态
condition of heightened watchfulness or preparation for action
一种重要性高于咨询的通知。
A notification of higher importance than an advisory.
警告使你对危险更加警觉
a warning serves to make you more alert to danger
备战状态。
A state of readiness for potential combat.
自动信号(通常是声音)警告危险
an automatic signal (usually a sound) warning of danger
bell(“响铃字符”)的同义词。
Synonym of bell (“bell character”).
The soldiers were placed on high alert after the suspicious activity was reported.
在报告可疑活动后，士兵们被置于高度戒备状态。
用法提示：这里“alert”作为名词，用于短语“on alert”，表示戒备状态。
AI contextual example
The weather service issued a tornado alert for the entire region.
气象部门向整个地区发布了龙卷风警报。
用法提示：这里“alert”作为名词，表示一种警告信号。
AI contextual example
Residents remained on alert for further aftershocks following the earthquake.
地震后居民保持警惕，以防余震。
用法提示：这里“alert”作为名词，用于“on alert”短语，表示警觉状态。
AI contextual example
The army is on alert for any possible attack.
军队对任何可能的袭击保持警觉。
也可用 send out an alert。
The government issued an alert about the approaching storm.
政府发布了关于即将到来的风暴的警报。
The siren sounded the alert to warn residents.
警报器拉响警报以警告居民。
grammar · medium
易错句子The soldiers were in alert.
正确表达The soldiers were on alert.
表示‘处于警戒状态’时，固定搭配介词为on，而非in。应使用‘on alert’或‘on the alert’。
grammar · medium
易错句子We received alert about the storm.
正确表达We received an alert about the storm.
alert作可数名词‘警报’时，单数形式前需加不定冠词a/an，表示‘一个警报’。
warning强调提醒危险或问题的具体信息或行为，而alert更侧重警觉的状态或自动信号。
alarm通常指发出刺耳声音或信号的装置，也可指恐慌情绪；alert作为名词多指警惕状态或为应对危险而发布的信号。
vigilance指持续、主动保持警惕的品质或行为，更正式；alert强调因外界刺激而短暂处于的高度戒备状态。
保持警惕；处于戒备状态
Police are on the alert for suspicious activity.
警方保持警惕，注意可疑活动。
发出警报
The system sounds an alert when the door is opened.
门被打开时，系统会发出警报。
发布警报；发出警告
The government issued an alert about the approaching storm.
政府发布了关于风暴来袭的警报。
红色警报；紧急戒备状态
The military was placed on red alert.
军方进入了红色警戒状态。
安全警报；安全警告
The airport was put on security alert after a suspicious package was found.
发现可疑包裹后，机场进入了安全警戒状态。
洪水警报
The river is rising, and the council has issued a flood alert.
河水上涨，市政委员会发布了洪水警报。
发出alert声响的设备，常见于火灾或空袭等紧急情况。
alert通常是针对emergency（如事故、灾害）发出的，二者常在同一语境中出现。
alert作为名词可指警觉状态，与vigilance概念相近但词性不同；在安全语境中常并列出现。
alert往往以notification的形式在系统或设备上显示，提醒用户注意。
收到alert后采取的行动或应对措施，常与预警系统搭配使用。
警惕着；戒备着
The guards were on the alert for any sign of movement.
警卫们警惕着任何动静。
红色警报；紧急戒备
The airport was put on red alert after the threat.
威胁发生后，机场进入红色警报状态。
高度戒备
Security forces remain on high alert along the border.
安全部队在边境保持高度戒备。
红色警报！——美国科幻剧《星际迷航》中舰长下令全员进入最高戒备状态时的著名口令。
The ship's computer sounded an alert the moment the enemy appeared on the radar.
敌舰出现在雷达上的那一刻，舰上的计算机就拉响了警报。
Choose the next layer that will help you use alerts with more confidence.
Missing: Antonyms
Complete this area with antonyms.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.