speck

Compared meaning: an extremely small piece of matter (noun).

比较义项：极小的颗粒或微粒（名词）。

• particle

  A general, often scientific term for an extremely small piece of matter; used for dust, sand, ash, or even physics particles like atoms and electrons.

  普遍化、常带科学色彩的词，指物质的极小微粒，可用于尘埃、沙粒、灰烬，甚至物理学中的粒子（如原子、电子）。

  A single particle of pollen drifted through the microscope's field of view.

  一粒花粉微粒飘过了显微镜的视野。

• speck 本词

  Emphasizes a tiny visible spot or mark, usually dust or dirt standing out against a background; a more everyday, descriptive word.

  强调一个微小但肉眼可见的斑点或痕迹，通常指衬托在背景上的灰尘或污渍；是更口语化、更具描述性的词。

  She wiped away a tiny speck of dirt from the mirror.

  她从镜子上擦掉了一小点灰尘。

Particle and speck both mean an extremely small piece of matter, but particle is a general, often scientific word, used for dust, sand, or even atoms. Speck emphasizes a tiny, visible spot, like dust or dirt on a surface, and is a more everyday word.

这两个词在此义项上意思相近，但语气略有不同：particle 更中性、常带科学色彩，泛指物质的极小颗粒；speck 更强调肉眼可见的小斑点或污渍，语气更口语化、更具体。这里只比较“极小颗粒”这一义项，不涉及其他用法。