A fluttering or tremulous sound, as that made by certain birds; a warble.

啭鸣， 抖音颤抖的或波动的声音，如某些鸟发出的叫声，啭鸣。

youdao

Oh... Oh... Ajiao is swinging the ship, sings that ancient ballad, the singing sound is fluttering with the wind, flutters to mine face.

喔…喔…喔…阿娇摇着船，唱着那古老的歌谣，歌声随风飘啊，飘到我的脸上。

youdao