mainstay
noun /ˈmeɪnsteɪ/
/ˈmeɪnsteɪ/
[usually singular]- mainstay (of something) a person or thing that is the most important part of something and enables it to exist or be successful
支柱;中流砥柱 - He is the mainstay of our theatre group.
他是我们剧组的台柱。 - Cocoa is the country's economic mainstay.
可可是这个国家的经济支柱。 - Love songs form the mainstay of his act.
情歌是他表演的主体。
- He is the mainstay of our theatre group.