Exercise is one of the few factors with a positive role in long-term maintenance of body weight.

锻炼是对长期保持体重有积极作用的少数因素之一。

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Secondly, by being a positive role model for their children, parents can shape their characters to a great extent.

其次，通过成为孩子的积极榜样，父母可以在很大程度上塑造他们的性格。

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Be a positive role model.

起到一个积极的示范作用。

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Former footballer and Deputy General-Secretary of the Union, Thulaganyo Gao Shubelwe, says footballers can play a positive role in conveying the safe-sex message because of the aura surrounding them.

VOA: standard.2010.05.29

If I played a positive role, I'm grateful to have had the chance to do so.

CNN

Washington also needs Beijing to play a positive role in the resolving regional hot spots.

CNN: Stakes are high for U.S., China during Clinton visit

Klein said Edwards played a positive role in spurring his competitors during the early part of the campaign.

CNN: Edwards' voters up for grabs