constituent 常可與component換用，指某一整體不可少的部分或成分。
element 指一個整體必不可少或固有的部分，強調一個復雜整體中最基本、最簡單的元件、元素或成分等。
ingredient 普通用詞，含義籠統。既可指混在一起而本身沒有變化的物質，如配料，又可指與別的物質混在一起，發生了變化的成分。
element的英語例句：
1. In order to make it safe, the element is electrically insulated.
為安全起見，該元件作了電絕緣處理。
2. There is an element of exhibitionism in the parents' performance too.
那對父母的表現也顯得有些愛出風頭。
3. With its unique heating element it makes perfect coffee.
其獨特的電熱元件使它能夠煮出非常美味的咖啡。
4. You will probably notice an element of quirkiness in his behaviour.
你可能會發現他的行為有點怪異。
5. The chronological sequence gives the book an element of structure.
時間順序讓這本書有了一定的結構。
6. European political union would be incomplete without a defence element.
如果沒有防御體系，歐洲政治聯盟就不完整。
7. The criticisms have at least an element of truth and validity.
那些批評至少有一絲真實性和合理性。
8. His testimony was an important element of the Prosecution case.
他的證詞是這宗公訴案件中的一個重要因素。
9. They have started showing a strong soul element in their sound.
他們的音樂風格開始表現出一種強烈的靈樂特色。
10. There is a strong element of truth to each of these explanations.
這些解釋每一個都很有道理。
11. My stepmother was in her element, organizing everything.
我的繼母得心應手地料理著一切。
12. Cost was a key element in our decision.
價錢是我們決策時考慮的主要因素。
13. Any investment involves an element of risk.
任何投資都有一定的風險。
14. Carbon is an element, while carbon dioxide is a compound.
碳是一種(化學)元素, 而二氧化碳則是一種化合物.
15. I am out of my element when people start talking about music.
人們一談論起音樂我就感到茫然。