particle, suffix, verb, adjective, idiom, noun, pronoun · particle used to introduce a relative clause, form a noun phrase, or indicate a passive construction; sometimes used for emphasis

我所需要的只是一个机会。

measure word, particle · classifier for houses, small buildings, and institutions

那所学校非常有名。

noun, particle · a place, location, or office

各所的研究领域各有侧重。