He says they are part of the genome of the last common ancestor of all birds,frogs, dinosaurs and mammals.

VOA: special.2010.06.29

He says,"provincials are like mold, burrowing in their little plots, or frogs at the bottom of their puddles, engaged in sordid, trivial rivalries, moved by petty jealousies, avarice and material interests.

他说,乡下人就像模子里刻出来的,在他们的自留地里乱挖一气,或者在泥浆里面挖青蛙,从事着肮脏,没什么竞争性的工作,为嫉妒,贪婪和物欲所驱动

耶鲁公开课 - 1871年后的法国课程节选

Yeah, this is not a bad time for me to remind you that in one of Plato's dialogues, Socrates says the Greeks sit like frogs around a pond and that pond is the Aegean Sea.

下面引用一下,柏拉图记录的一段对话,苏格拉底说希腊地形,就像一群青蛙围着一个池塘,而那池塘就是爱琴海

耶鲁公开课 - 古希腊历史简介课程节选

As a result, they used the frogs in fast-acting, low-cost pregnancy tests for women during the nineteen-forties and fifties.

VOA: special.2010.06.29

Scientists also studied eggs from the frogs to learn about the development of fertilized eggs into embryos.

VOA: special.2010.06.29

We will also tell about a project that scientists hope will protect an endangered species of frogs.

VOA: special.2010.06.29

And,Mister Hellsten says, genetic changes are rare for frogs, humans and most organisms.

VOA: special.2010.06.29

"To mention an example, we have found that about eighty percent of all genes that are known to be associated with human disease have a counterpart in frogs.

VOA: special.2010.06.29

Tropicalis is among the smaller frogs in the Xenopus group.

VOA: special.2010.06.29

There are about twenty different kinds of Xenopus frogs.

VOA: special.2010.06.29

and Smiley and the other man touched the frogs.

VOA: special.2009.08.29

"Maybe you understand frogs and maybe you don't.

VOA: special.2009.08.29

It tells about a jumping competition among frogs.

VOA: special.2010.03.21