suffer from deafness
suffer from 后接疾病或症状；此结构中 deafness 多作不可数名词。
Many older people suffer from some degree of deafness.
许多老年人患有某种程度的耳聋。
耳聋；聋
耳聋；听力缺失或丧失。；对某一问题或议题缺乏了解或拒绝承认。；不听；[医] 聋[症]
partial or complete loss of hearing
耳聋；听力缺失或丧失。
The condition of being deaf; the lack or loss of the ability to hear.
对某一问题或议题缺乏了解或拒绝承认。
Lack of knowledge or refusal to admit a particular problem, issue, etc.
His deafness made it difficult for him to hear the doorbell.
他的耳聋使他很难听到门铃声。
用法提示：用名词 deafness 表示听力丧失这一状态。
Modern hearing aids can help people cope with deafness.
现代助听器可以帮助人们应对耳聋。
用法提示：deafness 作不可数名词，指听力丧失。
She studied medicine to find ways to prevent deafness.
她学医是为了寻找预防耳聋的方法。
用法提示：deafness 作为抽象名词，指耳聋这种状况。
suffer from 后接疾病或症状；此结构中 deafness 多作不可数名词。
Many older people suffer from some degree of deafness.
许多老年人患有某种程度的耳聋。
用 in 短语指出耳聋发生的具体部位，如 left ear、right ear。
He has partial deafness in his left ear.
他的左耳有部分耳聋。
cause 是及物动词，直接以 deafness 作宾语，表示“导致耳聋”。
Loud noise can cause deafness.
巨大的噪音可能导致耳聋。
hearing loss 比 deafness 更宽泛，涵盖轻度到重度听力下降；在正式场合可互换，但日常语体中 deafness 更常特指完全或重度失聪。
hearing impairment 是医学/正式术语，侧重功能受损，范围比 deafness 广，不特指全聋；日常口语中不常用。
grammar · medium
易错句子The old man is deafness.
正确表达The old man is deaf.
deafness 是名词，表示“耳聋”这种状况，不能跟在 is 后面作表语形容词；描述某人“聋的”应用形容词 deaf。
grammar · medium
易错句子He has a deafness in both ears.
正确表达He has deafness in both ears.
deafness 表示“耳聋”时通常为不可数名词，前面不加不定冠词 a/an。
grammar · medium
易错句子He suffers deafness.
正确表达He suffers from deafness.
表示“患……病/受……之苦”时，suffer 是不及物动词，须搭配介词 from 才能接 deafness 这类名词。
指听觉能力；与耳聋相对。
deafness 是名词，指耳聋这种状态或疾病；deaf 是形容词，表示“聋的”，不能作名词使用。例如不能说 I have deaf，而要说 I have deafness。
deafening 是形容词，形容声音大得几乎使人耳聋；deafness 是名词，指耳聋这一状态。二者同根但含义相对，不能互换。
deafness 与 hearing loss 均指听力受损，但 deafness 更常指严重或完全的耳聋，作医学/正式用语；hearing loss 涵盖从轻微到严重的不同程度，更日常常用。
部分耳聋
He wears a hearing aid because of partial deafness.
由于部分耳聋，他戴着助听器。
完全失聪
The accident left her with total deafness.
那场事故使她完全失聪。
先天性耳聋
Congenital deafness can often be detected in early childhood.
先天性耳聋往往在幼儿期就能被检测出来。
感音神经性耳聋
Sensorineural deafness results from damage to the inner ear or auditory nerve.
感音神经性耳聋由内耳或听神经损伤引起。
患耳聋；失聪
Many older people suffer from some degree of deafness.
许多老年人有一定程度的耳聋。
deaf（聋的；词根）+ -ness（名词后缀，表状态/性质）→ 耳聋。同根词：deaf（聋的）、deafen（使聋）；同后缀词：illness（疾病）、darkness（黑暗）
耳聋涉及听觉器官耳朵的功能。
耳聋患者难以或无法感知声音。
手语是许多聋人使用的沟通方式。
听力学家专门评估和治疗听力问题。
人工耳蜗是一种帮助部分聋人恢复听力的植入设备。
选择性失聪，装聋作哑
My dad has selective deafness whenever I ask to borrow the car.
我爸爸每当我要借车时就选择性失聪。
执意充耳不闻，故意装聋
The company's willful deafness to customer complaints led to its decline.
公司对顾客投诉的执意充耳不闻导致了它的衰落。
外交式装聋作哑
His diplomatic deafness helped him avoid answering the reporter's awkward questions.
他的外交式装聋作哑让他避开了记者尴尬的提问。
失明使人远离事物；失聪使人远离人群。
This famous saying about deafness is attributed to Helen Keller, the American author and activist who was both blind and deaf, and it emphasizes that hearing loss can cut people off from one another.
这句关于失聪的名言出自美国作家兼活动家海伦·凯勒，她既失明又失聪；这句话强调的是听力丧失会让人与人之间失去联系。
Dictionary facts from ECDICT, WIKTIONARY.