In other words, if we cannot look back upon history and learn from the mistakes made by those who came before us (including ourselves), then there is little chance of improvement.
换句话说，如果我们不能回顾历史，从过去的错误(包括我们自己过去的经验)中吸取教训，就没有机会做出改进。
He has a happy childhood to look back upon.
他有一个幸福的童年可以回忆。
As I look back upon those years, I am struck by Annie's wisdom.
当我回顾过去那些岁月时，安妮的智慧使我惊叹不已。
Put all your effort into the coming months so that when you look back upon this time in the future, you can say with confidence: I have done everything I can, and I have no regrets.
把你的精力投入到接下来的几个月里，这样，当你以后回忆起这段时光的时候，你可以自信的说：我已尽我所能，不留遗憾。
I often look back upon the happy old days.
我经常回忆以前的快乐时光。
The aged people like to look back upon the old days.
上年纪的人喜欢回顾过去。
As I look back upon those years I am struck by Annie's wisdom.
当我回顾些那些岁月时，安妮的智慧使我惊叹不已。
Perhaps some day it will be pleasant to look back upon these days.
或许将来有一天回忆起这些日子很令人愉快。
Can you look back upon the last year of your life with satisfaction?
你能满足地回想你去年的生活吗？
Remember to look back upon your mistakes from time to time, but never regret them.
记得常回头看看以前犯的错误，但绝不要为它们感到后悔。
This closes the account of my services in wisconsin-a time full of struggle and yet a time that I like to look back upon.
我在威斯康星州任职的叙述到此结束。这是一段充满斗争的岁月，但也是一个我乐于回顾的时代。
I think that every one, no matter how many troubles he may have when he grows up, ought to have a happy childhood to look back upon.
我认为不管人们长大后会遇到什么麻烦，人人都应有一个幸福的童年可以回忆。
The competition makes me put down the books, and rest for a while, and start a real oral practice and look back upon my learning method, which really doubles the fun and speed of learning English!
恰逢这次比赛使我得以放下书本，暂歇片刻并在真实的环境中锻炼我的口语，总结反思过去的学习方法。这次比赛确实让我乐在其中也使我的英语学习效果事半功倍！
The competition makes me put down the books, and rest for a while, and start a real oral practice and look back upon my learning method, which really doubles the fun and speed of learning English!
恰逢这次比赛使我得以放下书本，暂歇片刻并在真实的环境中锻炼我的口语，总结反思过去的学习方法。这次比赛确实让我乐在其中也使我的英语学习效果事半功倍！
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