n.支柱,柱石,骨干,中流砥柱,主要的依靠,主桅支索
Agriculture is still the mainstay of the country's economy.
农业仍然是这个国家经济的主要支柱.
After the father's death the son became the mainstay of the family.
父亲死后,儿子就成了这个家庭的主心骨.
Cocoa is the country's economic mainstay.
可可是这个国家的经济支柱。