mainstay teachers骨干教师
equal mainstay平等主体
financial mainstay金融支柱
national mainstay民族脊梁
mainstay industry支柱产业
mainstay detail主要支柱
mainstay family主干家庭
mainstay industries支柱产业
economy mainstay市场经济主体
N-COUNT（可数名词） If you describe something as the mainstay of a particular thing, you mean that it is the most basic part of it. 最基本组成部分 [usu 'the' N 'of' n]
Fish and rice were the mainstays of the country's diet.
鱼和米是这个国家的主要食物。