柯林斯詞典substrate /?s?bstre?t/ 1. N the substance upon which an enzyme acts 基質[biochem] 返回 substrate劍橋詞典biology a substance or surface that an organism grows and lives on and is supported by 基質，培養(yǎng)基 chemistry a substance that an enzyme (= chemical made by living cells ) acts on to produce a chemical reaction 底物，酶作用物 返回 substrate