1
the redness of [sth]
表示一般红色特征。
The redness of the sunset was stunning.
夕阳的红色令人惊叹。
红；红色
先理解核心含义，再看它在真实句子里的用法。
红；红色
the quality or state of being red; red color or pigment
The redness of the sunset was stunning.
夕阳的红色令人惊叹。
红色的状态或特质
The state or quality of being red.
红色变色,尤指皮肤。
A red discoloration, especially of skin.
The redness of the ripe strawberries made them look even sweeter.
成熟草莓的红色让它们看起来更甜美。
She chose the scarf because she liked the deep redness of the fabric.
她选了这条围巾，因为她喜欢布料那深沉的红色。
The redness of the sunset slowly faded into purple.
落日的红色逐渐褪去，变成了紫色。
表示一般红色特征。
The redness of the sunset was stunning.
夕阳的红色令人惊叹。
用于医学或生理上的红肿。
She noticed redness on her arm after the burn.
她注意到烧伤后手臂上出现了红肿。
动词搭配表示引起或减轻红肿。
The cream helps reduce redness and irritation.
这种面霜有助于减轻红肿和刺激。
Not this
Her face was redness after exercise.
Use this
Her face was red after exercise.
“redness”是名词，不能用作表语形容词；应改用形容词“red”。
Not this
He had some rednesses on his arms.
Use this
He had some redness on his arms.
“redness”通常为不可数名词，表示整体红肿；复数形式“rednesses”很少用，此处不自然。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
皮肤发红
The cream reduces skin redness and irritation.
这种乳霜能减轻皮肤发红和刺激。
红肿
If you notice redness and swelling, see a doctor.
如果出现红肿，请去看医生。
减轻发红
This serum is designed to reduce redness.
这款精华旨在减轻发红。
面部发红
Facial redness is a common complaint among patients with rosacea.
面部发红是玫瑰痤疮患者常见的困扰。
眼睛发红
Eye redness may be caused by lack of sleep.
眼睛发红可能是睡眠不足引起的。
Use redness naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
red（红）＋ness（名词后缀）＝redness，看到皮肤发红就是红肿、发红。
语域：neutral 常见场景：dermatology notes、casual color descriptions redness 是中性常用词，多用于描述皮肤发红或物体呈红色的状态；在医疗和日常描述中都自然，没有明显的正式或非正式色彩。
The five -ness words match redness in the unstressed final syllable /nəs/, but none is a full rhyme because the stressed vowel differs. Redress is a spelling lookalike that sounds different (/rɪˈdrɛs/), so do not confuse it with redness.
Dictionary facts from ECDICT, WIKTIONARY.