archaic term for two: (古)。 同two he split it in twain. 他把它劈成两半。
常用词组 never the twain shall meet
used to suggest that two things are too different to exist alongside each other 两者永远合不到一块 families were either ‘church’ or ‘chapel’ and never the twain shall meet. 家庭要么是“教堂”,要么是“小礼拜堂”,只能为其一,不能兼而有之。