1
be covered with mildew
用被动结构描述物体表面布满霉斑。
The bathroom walls are covered with mildew.
浴室的墙上长满了霉。
霉；霉菌
先理解核心含义，再看它在真实句子里的用法。
霉；霉菌
A fungus that forms a whitish, powdery or webby growth on damp or decaying organic matter.
The bathroom walls are covered with mildew.
浴室的墙上长满了霉。
A growth of minute powdery or webby fungi, whitish or of different colors, found on various diseased or decaying substances.
霉变过程
the process of becoming mildewed
一种在有机物表面产生(通常为白色)生长的真菌
a fungus that produces a superficial (usually white) growth on organic matter
The damp basement had a strong smell of mildew.
潮湿的地下室有一股浓烈的霉味。
You need to remove the mildew from the shower curtain.
你需要清除浴帘上的霉菌。
Mildew started to grow on the wooden fence after the rainy season.
雨季过后，木栅栏上开始长霉。
用被动结构描述物体表面布满霉斑。
The bathroom walls are covered with mildew.
浴室的墙上长满了霉。
强调霉在特定条件下滋生，通常与潮湿环境相关。
Mildew grows on damp surfaces.
霉会在潮湿的表面上生长。
Not this
There are mildews on the bread.
Use this
There is mildew on the bread.
mildew 在表示“霉斑、发霉”这一物质或现象时通常作不可数名词，不能用复数 mildews；应使用单数形式，谓语动词用 is。
Not this
The bread is mildew.
Use this
The bread has mildew on it.
mildew 是名词，不能直接放在 be 动词后作表语表示“发霉的”；要表达“面包发霉了”，可说 The bread has mildew on it，用 have 表示“上面有霉”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
白粉病
The roses have powdery mildew again this year.
今年玫瑰又得了白粉病。
霜霉病
Downy mildew spread quickly through the wet vineyard.
霜霉病在潮湿的葡萄园里迅速蔓延。
霉味
There was a musty mildew smell in the old shed.
旧棚屋里有一股发霉的气味。
霉斑
The mildew stains on the ceiling were hard to remove.
天花板上的霉斑很难去除。
除霉剂
Use a mildew remover to clean the bathroom tiles.
用除霉剂清洁浴室瓷砖。
霉菌滋生
Good ventilation helps prevent mildew growth in the bedroom.
良好的通风有助于防止卧室里滋生霉菌。
Use mildew naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
读音似 mild dew（温和的露水）：露水让东西潮湿，于是长出白色的霉——mildew。
语域：neutral 常见场景：家居潮湿表面、植物病害、建筑材料养护 “mildew” 是中性常用词，多用于描述潮湿环境中物体表面出现的霉斑或霉变过程，也常见于植物病害和建筑维护话题；口语与书面语都自然，没有明显文体限制。
mildew /ˈmɪlˌduː/ has no common perfect rhyme. The final syllable /duː/ matches dew and due exactly, and the first syllable /mɪl/ matches mill. However, mildew is stressed on the first syllable, so dew and due do not rhyme with it. Few and new have the same /uː/ vowel but a different consonant before it; mild looks like mill but is pronounced /maɪld/ with a long /aɪ/.
Dictionary facts from ECDICT, WIKTIONARY.