mainstay
🇺🇸
/ˈmeɪnsteɪ/
🇬🇧
/ˈmeɪnsteɪ/
noun
R
The most important part of something that helps it exist or be successful.
Math is a mainstay of the school curriculum.
数学是学校课程的支柱。
translation
支柱
词形变化
Plural
mainstays