mainstayKK [ˋmenˏste] /ˈmeɪnˌsteɪ/發音名詞1支柱、中流砥柱、台柱She has been the mainstay of the team for a decade.十年來她一直是這支隊伍的中流砥柱。2主要來源、命脈Tourism remains the mainstay of the island's economy.觀光業仍是這座島嶼經濟的命脈。3主食、主要成分Rice and beans are a mainstay of their daily diet.米飯和豆類是他們日常飲食的主食。