alarm at/over sth
表示对某事感到惊慌或担忧；at/over 后接引起恐慌的原因。
There is growing alarm over the spread of the virus.
人们对病毒的蔓延越来越感到恐慌。
警报；警铃
alarms — plural of alarm
警报器；报警器；惊慌；恐惧；担忧；闹钟；警报声；闹铃声；备战号令；紧急召集
a sound or signal that warns of danger or gives notice of a problem
敌人来袭时的武装召集
A summons to arms, as on the approach of an enemy.
意识到危险而产生的恐惧
fear resulting from the awareness of danger
警告危险的声音或信息
Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.
发出不良事件信号的装置
a device that signals the occurrence of some undesirable event
警告危险的装置
A device intended to warn or give notice of approaching danger.
警告危险的自动信号(通常是声音)
an automatic signal (usually a sound) warning of danger
突然袭击或骚动
A sudden attack; a disturbance.
因危险而引起的惊恐
Sudden surprise with fear or terror caused by the apprehension of danger; a feeling of heightened alertness to risk.
唤醒或引起注意的机械装置
A mechanical device for awaking people or rousing their attention.
警报响起的实例
An instance of an alarm ringing, beeping or clanging, to give a noise signal at a certain time.
The smoke detector set off the fire alarm, and everyone evacuated the building.
烟雾探测器触发了火警警报器，所有人都撤离了大楼。
用法提示：这里 alarm 作为名词，指发出警告的装置。
She felt a growing alarm as the storm approached their campsite.
随着风暴逼近他们的营地，她感到越来越惊恐。
用法提示：这里 alarm 作为名词，指因意识到危险而产生的恐惧。
My car alarm went off when a bird landed on the hood.
一只鸟落在引擎盖上时，我的汽车警报器响了。
用法提示：这里 alarm 作为名词，指自动发出警告声音的装置。
表示对某事感到惊慌或担忧；at/over 后接引起恐慌的原因。
There is growing alarm over the spread of the virus.
人们对病毒的蔓延越来越感到恐慌。
in alarm 作状语，表示以惊慌的状态或方式做某事。
She looked up in alarm when she heard the noise.
听到响声时，她惊慌地抬起头。
go off 在此表示警报器突然响起，主语通常是 alarm、fire alarm 等装置。
An alarm went off when the door opened.
门打开时，警报响了。
grammar · medium
易错句子The school installed three new fire alarm last month.
正确表达The school installed three new fire alarms last month.
alarm 表示“警报器”时是可数名词，前面有基数词 three 就必须用复数形式 alarms；汉语名词没有复数标记，“三个新火警警报器”逐字直译时最容易漏掉词尾 -s。
grammar · medium
易错句子She stared at the broken window with an alarm.
正确表达She stared at the broken window with alarm.
表示“惊慌、恐惧”这一抽象情绪时 alarm 不可数，固定搭配 with alarm / in alarm 不加冠词；把汉语“一种惊慌”里的“一种”直译成冠词 an 就造成了错误。
grammar · medium
易错句子The alarm of the fire rang all night.
正确表达The fire alarm rang all night.
汉语用“的”连接修饰语（火灾的警报），英语中表示用途或类别的名词要直接前置作定语，构成 fire alarm，而不能用 of 短语；用 of 短语会变成另一种意思，不是指“火警警报器”。
指没有恐惧或惊慌的状态，与'alarm'表示的惊恐相对
alarm 常指会发出声音或信号的警报装置，或由此引起的惊慌；alert 作名词多指提醒危险的通知或警戒状态，强调让人保持警觉，不一定指物理警报器。
alarm 可泛指各种警报装置或警报声，如火警、防盗警报；siren 特指警车、救护车、消防车等发出的响亮警笛或这类装置。
alarm 是意识到危险时产生的惊恐或担忧，常可指短暂、尚能控制的反应；panic 指强烈且常失控的恐慌，往往导致慌乱行为。
设闹钟
I set an alarm for 7 a.m.
我把闹钟设在早上7点。
闹钟
My alarm clock didn't go off this morning.
我的闹钟今天早上没响。
拉响警报
Firefighters sounded the alarm and evacuated the building.
消防员拉响警报并疏散了大楼。
假警报
The fire drill turned out to be a false alarm.
消防演习原来是个假警报。
报警系统
They installed a new alarm system in the house.
他们在房子里安装了新的报警系统。
alarm + -ing
alarm + -ed
alarm + -ist
alarm + clock
fire + alarm
false + alarm
警钟
The sudden drop in sales set alarm bells ringing.
销售额的突然下降敲响了警钟。
虚惊一场
The fire was a false alarm.
这场火灾是虚惊一场。
发出警报
He raised the alarm when he saw smoke.
他看到烟雾时发出了警报。
Dictionary facts from ECDICT, WIKTIONARY.
引起恐慌
The news caused widespread alarm among the residents.
这条消息在居民中引起了广泛恐慌。