Human brain, universe, and life are regarded as the three world enigmas in science. It is one of the great challenges for human beings to make further research of human brain in the 21st century.

人脑、宇宙和生命被列为世界三大科学之谜，开展对脑科学的深入研究是人类21世纪面临的最重大的挑战之一。

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Shamanism' s theory of"the three world"embodies"the divine culture"in Jianger while the controlling act( witchcraft) reflects the transition of Jiangerfrom"the divine culture"to"human culture".

萨满教“三界说”在《江格尔》里体现了“神本文化”；而萨满教的控驭行为（巫术）则反映了《江格尔》从“神本文化”向“人本文化”过渡的状态。

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A new report by the I.M.F.estimates that the world economy will shrink by one and three-tenths percent this year.

VOA: special.2009.04.24

This is described as actually one of the top two or three acoustic concert halls in the whole world.

是不会坐到坏点位置,死角位置的，它被誉为是。

麻省理工公开课 - 化学原理课程节选

Within 20 degrees of separation from you initial smile to the three people, the entire world will be smiling.

只需要20度的分隔,从你用笑容感染三个人开始，全世界就会笑起来。

哈佛公开课 - 幸福课课程节选

Great Britain did not compete in the first of the three World Cup races, in the Czech Republic earlier this month.

BBC: New look to GB sprint canoe squad

The top three Americans, Adam Nelson, Reese Hoffa and Christian Cantwell are really considered the top three in the world.

NPR: Olympic Hopefuls Compete at Track and Field Trials

Having appeared and scored in the previous three World Cups, Beckham was expected to be selected for the tournament in South Africa in 2010.

BBC: David Beckham receives Lifetime Achievement award