1 sentence

1. 他们从来没听过猫唱歌，或者看到一只猫用后腿走路。

   tā​men cóng​lái méi tīng guo māo chàng gē, huò​zhě kàn dào yī zhī māo yòng hòu​tuǐ zǒu lù.

   They had never heard a cat sing, or seen a cat walk on its hind legs.

   Source: CCMatrix