a very small piece of something 颗粒；微粒 particles of dust/gold 灰尘；金屑 dust/gold particles 灰尘/黄金颗粒 There was not a particle of evidence (= no evidence at all) to support the case. 没有丝毫证据支持这个论点。
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grammar 语法 an adverb or a preposition that can combine with a verb to make a phrasal verb 小品词（与动词构成短语动词的副词或介词）
Word Originlate Middle English: from Latin particula ‘little part’, diminutive of pars, part-.