1. All you have to do is learn it by heart.
   你只要做的就是把它背出来。
2. He was stabbed to the heart by his son's misconduct.
   儿子的行为不检使他极为伤心。
3. He knows the rules by heart.
   他把规矩背起来。
4. Her heart was riven by grief.
   悲伤使她心碎。
5. Her heart was torn by grief.
   她肝肠寸断.

　1个副词解释