These brain regions play key roles in whether people convince others of their ideas.

这些大脑区域在人们能否让别人相信他们的想法上起着关键作用。

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Make sure that all key roles are filled.

要确保具备所有的关键角色。

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In each of these three forces, communication and information technology plays key roles.

再此三种力量的作用下，交流与信息技术扮演着关键的角色。

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Guys that have been to the World Cup before and have become real good leaders, some younger players that have played key roles throughout qualifying, some new players that came in late but still bring enthusiasm.

VOA: special.2010.06.09

Of course, financial knowledge and skills, information and research all still play key roles.

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Well-organized international criminal syndicates and local gangs play key roles in both internal and cross-border trafficking.

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Many people have blamed incentive compensation and moral hazard for playing key roles in the crisis.

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