1. Someday we are going to look back on these days.
   这种日子总有一天会过去的。
2. It can be fun to look Back on what you did in school.
   回忆学生生活是有趣的。
3. There was a blank look on his face.
   他脸上没有表情。
4. The philosopher looked on ahead to the wants of posterity.
   这位哲学家展望将来后世的需求。
5. He had an absent look on his face.
   他脸上露出心不在焉的神色

　2个动词解释