1. 微粒；极小量
A particle of something is a very small piece or amount of it.
e.g. ...a particle of hot metal...
热金属微粒
e.g. There is a particle of truth in his statement.
他的陈述中有一点点实话。
2. 粒子
In physics, a particle is a piece of matter smaller than an atom, for example an electron or a proton.
3. （语法中的）小品词
In grammar, a particle is a preposition such as 'into' or an adverb such as 'out' which can combine with a verb to form a phrasal verb.
名词微粒，颗粒; [数，物]粒子，质点; 极小量; 小品词