柯林斯詞典assay /??se?/ (assays) 1. N-COUNT An assay is a test of a substance to find out what chemicals it contains. It is usually carried out to find out how pure a substance is. 化驗(yàn); 測定[技術(shù)] 返回 assay劍橋詞典to perform an examination on a chemical in order to test how pure it is 鑒定，化驗(yàn)，分析（化學(xué)物質(zhì)的純度） 返回 assay