I often look back upon the happy old days.

我经常回忆以前的快乐时光。

youdao

He has a happy childhood to look back upon.

他有一个幸福的童年可以回忆。

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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。

youdao

For the answer, I look back upon the philosophy by which my mother, Mieke Frankenberg, led her life, through both its brightest and darkest hours.

CNN: With an open heart, giving is receiving

Yet, even as they look down on new immigrants, many Americans look back fondly upon their immigrant ancestors.

CNN: Commentary: Immigrants melting into the pot as usual

But just because 2005 is gone and done doesn't mean we can't take a moment to look back and reflect upon all the best gadgets and consumer electronics-related accomplishments (and blunders) of the year.

ENGADGET: The 2005 Engadget Awards