1 a very small piece; a bit 微粒;一点儿:
dust particles尘埃☞Look at alpha particle. 参看alpha particle。
2 (grammar语法) a small word that is not as important as a noun, verb or adjective 小品词(如介词、副词等);介副词:
In the phrasal verb ‘break down’, ‘down’ is an adverbial particle.在短语动词break down中,down是副词小品词。