to know by heart

• 牢记； 会背； 记住； 背下

to know by heart的用法和样例：

例句

1. The actress knew her lines by heart.
   那位女演员已牢记了她的台词。
2. I tried to fix the date in my mind.
   我试着把那个日期牢记在心。
3. Remember to wring your swimsuit out after you swim.
   记住游泳过后要把游泳衣拧干。
4. You should know these words by heart.
   你们应该记住这些单词。
5. She set herself to learn the poem by heart.
   她集中精力要把这首诗背下来。
6. Then you recite the story and tell it to others.
   然后，我们把这些小故事背下来，讲给别人听。