The number of babies born to teenage mothers has followed a downward trend since 1994 ; the poverty rate is below the level of a decade ago ; drug use is down from the high levels of the 1980s ; and most significantly , crime rates have plummeted since 1992 未成年母亲生下的孩子，数量自1994年起下降，一直维持到现在；贫民比例比10年前低；滥用药物的情况比1980年代的风行高潮好了一些；最重要的是，犯罪率自1992年起急遽下降。
Net capital flows as a percentage of gdp among developed nations were higher at the beginning of the 20th century than they were at the century s end . the world of a century ago also was a dynamic period of social movements and ideas that transformed societies and changed lives 正如美联储主席艾伦?格林斯潘所说，百年前的贸易在世界经济产出中所占的比例同当今大致相同。在发达国家中， 20世纪初的净资本流动额在国内生产总值中所占的比例比20世纪末还要高。
A growing number of mainland residents plan to increase their savings as opposed to increasing spending , a quarterly survey conducted by china ' s central bank suggests . about 36 . 8 percent of 20 , 000 respondents surveyed said " more saving " is a better option at present than " more spending , " up 2 . 2 percentage points from a quarter ago , the people ' s bank of china said on its 据中国人民银行昨天在其网站上发布的消息，在参加此项调查的2万人中，约36 . 8 %的人说，在目前状况下， "多存钱"比"多花钱"明智，这个比例比上季度的调查高出2 . 2的百分点。
In the analysis of the factor model , the total risk of the stock return is divided into system risk and individual risk and the r2 measure is used as an indicator of the system risk in the stock return risk . our statistical result shows that the system risk of the stock return is reduced significantly , comparing with the earlier period of the chinese stock market . the potential of the risk diversification of a stock portfolio is greatly enhanced 在单指数模型中，股票收益的风险被分解为系统风险和非系统风险，而单指数模型的r ~ 2可以作为股票风险中系统风险所占比例的量度，统计结果指出我国市场股票价格风险中系统风险所占比例比市场发展的初期明显下降，股票价格风险中公司个别风险已占较大比重，应用资产组合理论构造投资组合可以有效地分散风险。
