used to suggest that two things are too different to exist alongside each other
两者永远合不到一块
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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。[ORIGIN from Rudyard Kipling's ‘Oh, East is East, and West is West, and never the twain shall meet’.