研究所 (yán jiū suǒ) means “research institute; graduate studies; graduate school”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Measure word: 个
他在研究所工作了五年。
Tā zài yánjiūsuǒ gōngzuò le wǔ nián.
He has worked at the research institute for five years.
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