learn sth by memory

• n. 背诵；熟记

例句

用作名词 (n.)

1. Mary could repeat many poems from memory.
   玛丽能背诵许多诗歌。
2. The students had to learn the poem by heart.
   学生们必须背诵这首诗。
3. The orator had conned it by heart.
   演讲者已把它熟记在心。
4. His professor forced him to learn every line of the Koran.
   他的教授要他熟记每一条古兰经。