the earpiece of [something]
用 the earpiece of ... 指出听筒所属的设备。
The earpiece of the old telephone had a faint crackle.
旧电话的听筒里传来微弱的噼啪声。
耳机；听筒
earpieces — plural of earpiece
置于耳内或贴近耳朵的扬声器；电话听筒,贴近耳朵接听；眼镜的镜腿,钩住耳朵以固定；护耳片
earpiece
指耳机、听筒等电声换能器，不指眼镜脚或护耳片。
置于耳内或贴近耳朵的扬声器
A speaker placed inside or held near to the ear.
电话听筒,贴近耳朵接听
A receiver of a telephone to hold near to one's ear.
眼镜的镜腿,钩住耳朵以固定
The arm on a pair of glasses that hooks over the ear to hold them in place.
She put the earpiece in her ear to listen to the audio guide.
她把耳机塞进耳朵里听语音导览。
用法提示：此处'earpiece'是名词，指塞入耳中的小型耳机或听筒。
The security guard adjusted his earpiece to hear his supervisor's orders more clearly.
保安调整了一下耳机，以便更清楚地听到主管的指令。
用法提示：这里'earpiece'作名词，表示戴在或塞入耳朵的接收设备。
The interpreter wore two earpieces, one for each ear, to avoid missing any part of the conversation.
译员戴着两个耳机，一只耳朵一个，以免漏掉谈话的任何内容。
用法提示：这里用复数形式'earpieces'，指两个听筒或耳机。
用 the earpiece of ... 指出听筒所属的设备。
The earpiece of the old telephone had a faint crackle.
旧电话的听筒里传来微弱的噼啪声。
表示某人耳朵里戴着耳机，常用 have an earpiece in ... 结构。
He had an earpiece in his ear during the interview.
面试时他耳朵里戴着一只耳机。
one of the earpieces 指一对耳机中的一只，谓语动词用单数。
One of the earpieces stopped working during the meeting.
会议期间，两只耳塞中有一只失灵了。
与 earpiece 含义最接近，通常可互换；但 earphone 更常用于泛指任何耳机，而 earpiece 可指单侧听筒。
earbud 专指入耳式小耳机；若 earpiece 指头戴或挂耳式的器件，则不能用 earbud 替换。
headphone 常指戴在头上的整副耳机（复数 headphones），而 earpiece 可指单个部件；单独指一只耳塞时不宜直接用 headphone。
grammar · medium
易错句子She spoke into the earpiece during the online meeting.
正确表达She spoke into the microphone during the online meeting.
句意是“对着麦克风说话”。earpiece指贴近耳朵的听筒，用于收听而非说话；说话用的设备是microphone。不能把“听筒”的译法直接套到“麦克风”上。
grammar · medium
易错句子There are three earpiece in the bag.
正确表达There are three earpieces in the bag.
earpiece是可数名词，复数形式为earpieces。汉语名词没有单复数变化，此处需要加-s体现复数。
earpiece 常指单个听筒或电话/耳机的一部分，也指塞入耳中的听筒；earphone 是“耳机”的通称，强调放音设备本身，不指电话听筒。
headphone（常用复数 headphones）是包住或盖住整个耳朵、带头梁的耳机；earpiece 是单个塞入或挂在耳边的听筒，不覆盖整个耳朵。
earplug 是插入耳道用来隔音或防水的耳塞，不发出声音；earpiece 是插入或贴近耳朵播放声音的听筒。
蓝牙耳机
She answered the call using a Bluetooth earpiece.
她用蓝牙耳机接听了电话。
耳机音量
Turn up the earpiece volume if you can't hear the caller clearly.
如果听不清对方说话，就把耳机音量调大。
电话听筒
He held the phone earpiece close to his ear.
他把电话听筒贴近耳朵。
左耳机
My left earpiece suddenly stopped working.
我的左耳机突然不响了。
耳机线
The earpiece wire got tangled in my bag.
耳机线在包里缠住了。
耳塞是音频输出设备，用于播放音频信号。
头戴式耳机包含耳塞部分，是包含耳塞的完整设备。
麦克风与耳塞常配合使用，分别负责声音输入和输出。
电话听筒中装有耳塞，用于听取对方声音。
使用耳塞时通常需要调节音量以获得合适的听觉体验。
Dictionary facts from ECDICT, WIKTIONARY.