never the twain shall meet

used to suggest that two things are too different to exist alongside each other

兩者永遠(yuǎn)合不到一塊

families were either ‘church’ or ‘chapel’ and never the twain shall meet.

家庭要么是“教堂”，要么是“小禮拜堂”，只能為其一，不能兼而有之。