今天我们要学的词是mainstay。 Mainstay, 支柱，重要来源。 "Picture books, a mainstay of children’s literature, have been on the decline," 儿童文学的重要组成部分---图画书发行的数量正在走下坡路。在美国， "Cranberries are a mainstay of holiday feasts," 小红莓是节日大餐不可缺少的重要成分。 "The Mama Bakery around the corner has been a mainstay in our area," 拐角处的妈妈面包铺是我们这个地区的居民离不开的小食品店。 "Once a mainstay of finding people, the White Pages are quickly fading away," 一度曾是找人必备的电话白页，如今正在迅速消亡。好的，今天我们学习的词是mainstay...