translation.en: Humpbacks, when they develop the ability to sing this song, they're listening to other whales and modifying what they sing based on what they're hearing, just like song birds or the dolphin whistles I described.
translation.zh: 当座头鲸发展出 能发出这样的歌声的能力时， 它们就能听到来自其他鲸的声音， 并且基于它们所听到的来改变音调， 就像鸟的啼声或是我描述的海豚的哨声。