Their song consists mainly of a rapidly repeated note, like a trill.

它们唱的“歌”主要是在快速重复一个音符，类似一种颤音。

youdao

Their song consists mainly of a rapidly repeated note, like a trill.

它们唱的“歌”主要是在快速重复一个音符，类似一种颤音。

youdao