sing by ear

• vt. 凭记忆演奏(即席演奏)

例句

用作及物动词 (vt.)

1. All compositions must be played by memory.
   所有曲目必须凭记忆演奏。
2. He is bind, but he can play many beautiful songs by ear.
   他是个盲人，但他能凭记忆演奏许多动听的歌曲。