look back (on)的用法和樣例：
例句
- She looked back over a distance of ten years.
她回顧過(guò)去十年的時(shí)間。 - She never looks back to the old days with regret.
她從不懷著(zhù)悔恨的心情回顧過(guò)去。 - Her mind had strayed back to her childhood.
她失了神，回想著(zhù)自己的童年。 - I keep on thinking about where I left my purse.
我一直都在回想自己到底把錢(qián)包落在哪兒了。
