1N-COUNT 选区居民;(尤指)选民 A constituent is someone who lives in a particular constituency, especially someone who is able to vote in an election. 选区居民;(尤指)选民
2N-COUNT 成分;要素 A constituent of a mixture, substance, or system is one of the things from which it is formed. 成分;要素
Caffeine is the active constituent of drinks such as tea and coffee. [+ of]