"But this has raised concern that O.E.C.D countries were mainly exporting their shortage problem to countries that may have an even greater need for these nurses."

VOA: special.2010.06.07

The CHD stands for coronary heart disease - in--across these seven countries, from the lowest to the highest.

HD就是冠心病的意思,从最高到最低差异高达十倍

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

These basic principles are important," Dr.Pappas emphasizes that, while there is no cause for alarm, countries where health care infrastructure is weak are the most vulnerable.

VOA: standard.2009.04.28

But the commissioners noted what they called 'the harsh fact that these countries are among the poorest on earth, and that the full claims would have been impossible for either side to pay.

VOA: standard.2009.08.20