1
a blotch of sth on sth
blotch 指形状不规则的斑点或污渍，通常比 spot 大。
There was a blotch of red paint on his shirt.
他的衬衫上有一块红漆污斑。
斑点；污斑
blotches — plural of blotch
先理解核心含义，再看它在真实句子里的用法。
斑点；污斑
blotch
There was a blotch of red paint on his shirt.
他的衬衫上有一块红漆污斑。
颜色不均匀的斑块或变色。
An uneven patch of color or discoloration.
形状不规则的区域。
An irregularly shaped area.
瑕疵；名誉上的污点,污渍。
Imperfection; blemish on one’s reputation, stain.
多种作物病害之一,使植物形成斑点。
Any of various crop diseases that cause the plant to form spots.
A large red blotch appeared on his arm after he touched the plant.
他碰到那株植物后，胳膊上出现了一大块红斑点。
The old painting had a dark blotch in the corner that no one could clean.
那幅旧画的角落有一块深色污斑，没人能擦掉。
She noticed a small blotch on the paper and tried to erase it.
她注意到纸上有一个小斑点，想把它擦掉。
blotch 指形状不规则的斑点或污渍，通常比 spot 大。
There was a blotch of red paint on his shirt.
他的衬衫上有一块红漆污斑。
皮肤上的 blotches 常与皮疹、日晒或肤色不均有关。
The rash left red blotches on her arms.
皮疹在她胳膊上留下了红色的斑块。
Not this
There is a red blotch in his face.
Use this
There is a red blotch on his face.
表示斑点出现在皮肤表面时，介词应用 on，不用 in；in his face 会被理解成在脸部内部。
Not this
There are many blotch on his arm.
Use this
There are many blotches on his arm.
blotch 是可数名词，复数形式为 blotches；句中 many 和 are 都要求使用复数。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
红色斑块
The rash left red blotches on her arms.
皮疹在她胳膊上留下了红色斑块。
深色斑点
Dark blotches appeared on the old photograph.
旧照片上出现了深色斑点。
皮肤上的斑点
He noticed blotches on the skin of his hands.
他注意到手部皮肤上有斑点。
一块墨渍
A blotch of ink stained the letter.
一块墨渍弄脏了那封信。
脸上的斑块
She tried to hide the blotches on her face with makeup.
她试图用化妆品遮住脸上的斑块。
晒伤斑
Sunburn blotches covered his shoulders after the long hike.
长途徒步后，他的肩膀上布满了晒伤斑。
Use blotches naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：blotch 里看到 blot（污渍），加 ch 后变成不规则的大斑点。
语域：neutral 常见场景：everyday descriptions of stains or spots、skin/rash descriptions、general descriptive writing blotch 作名词时指形状不规则的斑点，通常用于描述皮肤上的疹块、物体表面的污渍或颜色斑块。该词在日常和一般书面语中都比较常见，语气中性；在医学语境中描述皮疹时也常用，但并非严格医学术语。
英式发音中，botch、notch、splotch、watch、scotch 都与 blotch 押韵（/ɒtʃ/）；美式英语里 watch 读 /wɑːtʃ/，不再押韵。注意 batch、catch、match、patch 等词形相近，但读 /ætʃ/，与 blotch 不押韵。
Dictionary facts from ECDICT, WIKTIONARY.