to know by heart的用法和樣例：
例句
- The actress knew her lines by heart.
那位女演員已牢記了她的台詞。 - I tried to fix the date in my mind.
我試著把那個日期牢記在心。 - Remember to wring your swimsuit out after you swim.
記住游泳過後要把游泳衣擰乾。 - You should know these words by heart.
你們應該記住這些單詞。 - She set herself to learn the poem by heart.
她集中精力要把這首詩背下來。 - Then you recite the story and tell it to others.
然後，我們把這些小故事背下來，講給別人聽。
