Rice breeding for maximum yield is a hot topic today in the world and a tremendous challenge as well.

水稻超高产育种是当前世界性的热门课题，也是难题。

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Immigration reform, I mean, this is a very hot topic today in the Senate.

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The gender gap in voting is the latest hot topic after a USA Today poll showed Obama leading women voters over Romney by 18 points in key swing states.

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The results proved that this issue remains a hot bedded topic, with updates nearly every minute throughout the evening and through today.

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