Behind this is the rise of emerging countries such as China and the elevation to the middle class of billions of people who now require a diet richer than the traditional staples of rice and wheat.

在这股趋势的背后，则是中国等新兴国家的崛起，以及数十亿中产阶层的兴起——这部分人如今在饮食上要求更为丰盛，已不满足于稻米和小麦这些传统主食。

youdao

My students seem equally quick and bright in class but when I look at their written work it's easy to separate the wheat from thechaff.

我的学生在课堂上好像都一样聪明敏捷，但看一看他们的作业，就很容易看出好坏。

youdao