translation.en: And about two or three years after they can hear as well as you and I can, they'll be able to hear maybe how bats sing, or how whales talk, or how dogs talk, and other types of tonal scales.
translation.zh: 在他们可以像你我一样听得大约2到3年以后， 他们或许能听见蝙蝠如何歌唱，鲸鱼是如何交谈， 狗儿如何聊天，或者其他的声调，