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over the loudspeaker
over the loudspeaker 表示信息通过扩音器传播。
The announcement came over the loudspeaker.
通知是通过扩音器播出的。
扩音器；喇叭；扬声器
先理解核心含义，再看它在真实句子里的用法。
扩音器；喇叭；扬声器
a device that changes electrical signals into sounds loud enough to be heard at a distance
The announcement came over the loudspeaker.
通知是通过扩音器播出的。
将电信号转换为可听声音的机电换能器。
An electromechanical transducer that converts an electrical signal into audible sound.
将电信号转换为足够响亮以便远距离听到的声音的电声换能器
electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
音量大的扬声器,区别于耳机等低音量设备。
Any such transducer that is loud, as opposed to quiet ones such as those found in headphones.
装有扬声器单元及驱动器等电气设备的外壳。
An encasing containing one or more loudspeaker devices and usually other electrical equipment such as a driver.
The coach used a loudspeaker to give instructions to the players from across the field.
教练用扩音器从球场另一边向队员们发出指令。
A loudspeaker announced that the last train would arrive in five minutes.
一个扬声器通知说，最后一班列车将在五分钟后到达。
We could hear the music from the loudspeakers at the street fair.
我们可以听到街头集市上喇叭里传来的音乐。
over the loudspeaker 表示信息通过扩音器传播。
The announcement came over the loudspeaker.
通知是通过扩音器播出的。
用复数 loudspeakers 时通常指多个扬声器。
Music was playing through the loudspeakers.
音乐正通过扬声器播放。
loudspeaker system 是常见搭配，指扩音系统。
The school installed a new loudspeaker system.
学校安装了一套新的扬声器系统。
Not this
I need loudspeaker for the meeting.
Use this
I need a loudspeaker for the meeting.
loudspeaker 是可数名词，单数形式前要有冠词 a；中文习惯说“需要喇叭”而省略量词，英语不能省。
Not this
Can you hear the announcement in the loudspeaker?
Use this
Can you hear the announcement over the loudspeaker?
表示声音通过扬声器传出，英语用 over/through the loudspeaker，不用 in；in 表示“在扬声器内部”，不是人听到的外部播放。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
扬声器系统；扩音系统
The school installed a new loudspeaker system for announcements.
学校安装了一套新的扬声器系统用于发布通知。
内置扬声器
This monitor has a built-in loudspeaker, so you don't need external speakers.
这台显示器有内置扬声器，所以不需要外接音箱。
外接扬声器；外部扬声器
For better sound, connect an external loudspeaker to the player.
为了获得更好的音质，将外接扬声器连接到播放器上。
通过扩音器（播放、宣布）
The train delay was announced over the loudspeaker.
列车晚点的消息通过扩音器播报了。
发长 /iː/ 音 (如 sea, tea)
Same pattern, same sound
Use loudspeaker naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
loud（大声的）+ speaker（说话者）→ 联想有人大声说话让你听清，就是扩音器/喇叭。
语域：mixed 常见场景：音响设备说明、公共广播系统、技术规格 该词为中性偏正式的词，比较常见于正式说明或技术文档；日常口语中更常说 speaker。
loudspeaker 的重音在第一个音节 loud 上，整个词没有普通英语词与之押韵；loud 与开头的 loud 读音相同，speaker 与词尾 -speaker 的读音相同。beaker、sneaker、weaker 只是拼写结尾同为 -eaker，读音为 /iːkɚ/，与 /spiːkɚ/ 的辅音不同，并不押韵，别被拼写误导。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
Watch the sound change