There is nothing in the world of art like the songs mother used to sing.

母親唱過(guò)的歌是世界上獨(dú)一無(wú)二的藝術(shù)?！壤ば恋?/p>

語(yǔ)言點(diǎn)：used to do
表示過(guò)去常常做的事情，和情態(tài)動(dòng)詞would do表示過(guò)去常做某事用法相近

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