keyword_learning:与关键字学习相关的一切都在这里

[u'百万'u'人口'u'人民'u'000'你说'u'10'u'民族'u'巴西'u'估计'] [u'百万'u'2014'u'emissions'u'according'u'united'u'tons'u'usd'u'states'u'billion'] [u'years' u'life' u'expectancy' u'average' u'47' u'60' u'world' u'81' u'europe'] [u'percent'u'inflation'u'year'u'july'u'rate'u'bank'u'august'u'end'u'official'] [u'人口'u'国家'u'世界'u'百万'u'总数'u'最大'u'2011'u'人口普查'u'28'] [u'year'u'billion'u'gdp'u'domestic'u'10'u'pakistan'u'trillion