warble
v
(a) [I] (esp of a bird) sing in a continuous gentle trilling way (尤指鸟)叫出柔和的颤音
larks warbling in the sky 在天空婉转叫著的百灵鸟.
(b) [Tn] sing (a note, song, etc) in this way 用柔和的颤音唱(某音、 歌等). warble, n (usu sing 通常作单数) warbling sound 柔和的颤音
the blackbird´s warble 黑鹂婉转的叫声.