1
a/an + cumulus
作为可数名词，可用不定冠词 a 表示一朵积云。
A cumulus floated across the sky.
一朵积云飘过天空。
积云
先理解核心含义，再看它在真实句子里的用法。
积云
a type of thick white fluffy cloud that forms in rising air
A cumulus floated across the sky.
一朵积云飘过天空。
一堆或小丘。
A heap or mound.
球状云
a globular cloud
通过对流形成的大而蓬松的白色云朵。
A large white, puffy cloud that develops through convection.
一堆叠放在一起的物体
a collection of objects laid on top of each other
The sky was dotted with fluffy white cumulus clouds.
天空中点缀着蓬松的白色积云。
A large cumulus cloud formed over the mountain.
一座巨大的积云在山顶形成。
Cumulus clouds often indicate fair weather.
积云通常预示着好天气。
作为可数名词，可用不定冠词 a 表示一朵积云。
A cumulus floated across the sky.
一朵积云飘过天空。
定冠词特指某个已知的积云。
The cumulus turned grey.
那朵积云变成了灰色。
cumulus 可作定语修饰名词，表示积云类型的。
Cumulus clouds are white and fluffy.
积云洁白而蓬松。
Not this
The sky is full of cumulus.
Use this
The sky is full of cumulus clouds.
Cumulus 是可数名词，作“积云”讲时不能单独用作不可数名词，通常需要加 clouds 或使用复数形式 cumuli。
Not this
The clouds cumulus quickly.
Use this
The clouds form cumulus quickly.
Cumulus 是名词，不能直接作动词使用。表示“形成积云”需用动词 form 或 become。
Choose the next layer that will help you use cumulus with more confidence.
Recommended next
Missing: Collocations
Complete this area with collocations.
More ways to explore
Includes Word components & Thematic vocabulary
Learn how to build related words using roots, prefixes, and thematic clusters.
Includes Idioms & Cultural references
Discover idioms, slang, and famous pop culture quotes.
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use cumulus naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想“cumulus”中的“cum”与“accumulate（积累）”同源，积云就是堆积起来的云团。
语域：formal 常见场景：meteorology、weather reports、cloud classification 通常用于气象学或科学描述，属于正式或技术语境。
Only 'tumulus' rhymes with 'cumulus' (stressed vowel /uː/ and following sounds match). 'Calculus', 'stimulus', 'modulus', and 'annulus' share the -ulus spelling but differ in stress or vowel quality.
Dictionary facts from ECDICT, WIKTIONARY.