What once was happy now is sad.

曾经快乐如今悲伤。

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In every kind of adversity, the bitterest part of a man's affliction is to remember that he once was happy.

在各种逆境中，人们感受到最大的痛苦莫过于回忆起曾经拥有的幸福。

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He once was a very active and happy boy.

他以前很活泼好动，是一个快乐的孩子。

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Once everyone was happy with the speech, we proposed that the speaker rehearse.

FORBES: Why You Must Rehearse: to Avoid Public Speaking Disasters Like This One

He was happy to once again admit New Labour probably went too far in trying to handle, and manipulate the media when in opposition - but that, he suggested, was because they had given Labour such an appalling time in the past.

BBC: Analysis

Mr Simon was happy to acknowledge that he had once touched the real world in commerce (and in the United States navy, where he spent three years), although in fact nearly all his adult career was in academe.

ECONOMIST: Julian Simon