1) The birds are singing their hearts out.

鸟在欢快地歌唱。
2) A bird is singing a song happily.

鸟在愉快地唱歌
3) To sing in a loud, joyous manner.

欢快地高声歌唱
4) The birds were singing.

小鸟在欢唱。
6) The blackbird is singing.

山鸟在歌唱。
补充资料:欢快
欢乐轻快:~的心情ㄧ~的乐曲。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条