"The red wigglers are the best varieties for doing it because they are more of a surface feeder.

VOA: special.2011.07.05

So there are these varieties of ways for describing what's going on in a text.

所以，有各种不同的方法,可以描述文本。

耶鲁公开课 - 文学理论导论课程节选

As we'll talk about later in the class, the biodiversity has shrunk so what used to be hundreds of varieties of corn is now just a few.

像我们后面所要提到的,玉米种群的生物多样性已经从曾经的,几百种减少到了现在的几种

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

"This is a new strain of stem rust organism that has the power to destroy most of the wheat varieties being grown around the world."

VOA: standard.2009.09.16

There's a lot of varieties which-- okay.

有很多变化

耶鲁公开课 - 聆听音乐课程节选

In 1944,when many experts warned of mass starvation in developing nations where populations were expanding faster than crop production, Borlaug began work at a Rockefeller Foundation-funded project in Mexico to increase wheat production by developing higher-yielding varieties of the crop.

VOA: standard.2009.09.13

"And so once we understand the genetics, we can try and just take those particular genes and work with popular varieties of rice to cross those particular genes into a popular variety and still maintain the expected cooking and eating qualities of the grain."

VOA: standard.2010.06.25