a fleck of dust
collocation一粒灰尘；一点灰尘
There was a fleck of dust on the lens.
镜头上有一粒灰尘。
小斑点；斑点；斑痕
flecks — plural of fleck
先理解核心含义，再看它在真实句子里的用法。
小斑点；斑点；斑痕
a small spot or streak; a speckle
The old painting had a tiny fleck of blue paint near the corner.
那幅旧画在角落附近有一小块蓝色颜料的斑点。
薄片
A flake.
羊毛等的束
A lock, as of wool.
小斑点或条纹；斑点
A small spot or streak; a speckle.
少量
A small amount.
She noticed a fleck of dust on her glasses and cleaned them immediately.
她注意到眼镜上有一点灰尘，立刻擦了擦。
The bird's feathers were brown with white flecks scattered across them.
这只鸟的羽毛是棕色的，上面散布着白色斑点。
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一粒灰尘；一点灰尘
There was a fleck of dust on the lens.
镜头上有一粒灰尘。
血点；血斑
The towel had flecks of blood on it.
毛巾上有血点。
油漆斑点
His shirt was covered in flecks of paint.
他的衬衫上沾满了油漆斑点。
微小的斑点
Tiny flecks of gold glittered in the rock.
岩石中闪烁着微小的金色斑点。
泡沫碎屑
The waves left flecks of foam on the sand.
海浪在沙滩上留下泡沫碎屑。
一点色彩
The grey sky had no fleck of colour.
灰色的天空没有一点儿色彩。
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联想：fleck 和 freckle（雀斑）同含 fle，freckle 是皮肤上的小斑点，fleck 即小斑点。
语域：neutral 常见场景：描述外观或表面、日常对话、书面描写 通常作名词，指小斑点、小颗粒或少量；多用于描述物体表面的细小痕迹，也可用在日常和书面语中。其他较专门的义项（如羊毛束）用得较少。
这些词都与 fleck /flek/ 押韵，结尾均为 /-ek/：check, deck, neck, peck, speck, wreck。注意形近词 flex /fleks/ 读作 /-eks/，与 fleck 不押韵。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.