The new study found that the number of damselfish is not the issue.

VOA: special.2010.08.10

Now if any of you are interested in exploring this issue of food and history there's an awful lot written about it a number of books that have been written about it that are quite good.

现在,如果谁,对探究食物与人类历史的关系有兴趣的话,有很多关于这方面的著作,很多这方面的好书

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

An increasing number of white Americans, however,saw slavery as an economic issue.

VOA: special.2009.04.30

So we are going to be fighting a huge number of technology challenges. Then there is the whole scale issue.

VOA: standard.2009.09.24

It is an issue where we need to take concrete action to increase the number of women in politics and especially at decision-making levels in politics,".

VOA: standard.2009.04.05

But recent public opinion polls show that a growing number of Americans disapprove of his handling of the health care issue, and that in turn has emboldened Republicans trying to block reform efforts in Congress.

VOA: standard.2009.09.02