He decided to turn a new leaf and work hard for his girl friend.

他决定痛改前非，为了他的女朋友努力工作。

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The thief was determined to turn a new leaf once he was released from prison.

那读贼下决心，一旦获释便棕新做伤。

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As flowers unfold and life renews, it is hard to imagine a more perfect setting for smokers to turn a new leaf and quit smoking.

花开花落，新的生命重新开始。用这来形容吸烟者戒烟并重新开始新的生活是再恰当不过的了。

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Beyond that, there's Venezuela and Bolivia, and both leaders made overtures to the president-elect, saying they wanted to turn a new leaf, open a new page.

NPR: Obama Win Changes Perceptions Abroad

To turn over a new leaf means to flip to a new page.

CNN: In the new year, be a first responder

Apple is understandably working to improve the mapping application, and removing Williamson appears to be part of an attempt to turn over a new leaf.

FORBES: Report: Maps Chief Ousted at Apple