They point out that free-time activities play an important role in childhood development and that large amounts of homework reduce children's free time, hindering their development.

他们指出，业余活动在儿童发展中发挥着重要作用，大量的家庭作业减少了孩子的业余时间，阻碍了他们的发展。

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Once the lithium ions are free, they move only in and out of the active material, and the inactive material continues to play its stabilizing role.

一旦锂离子是免费的，他们只移动进出的活性物质，不活跃的物质继续发挥稳定作用。

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What role could free trade play?

自由贸易起什么作用？

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Many Libyans were concerned that a free Gadhafi might play a role in destabilizing Libya in the future, he said.

CNN: Celebrations erupt in Libya amid news of Gadhafi's death

Previous studies have suggested that both inflammation and free-radical damage may play a role in the onset of Alzheimer's and Parkinson's disease.

BBC: 'Eating less may prevent Alzheimer's'

MapleStory is a 2D, free-to-play massively multiplayer online role playing game that has more than 9 million registered players in North America and more than 116 million players worldwide.

FORBES: Connect