Researchers have known since the nineteen thirties that the actively growing tip of a plant releases a hormone called auxin.

VOA: special.2009.10.13

So this is, in effect, the backdrop in which in the American academy--influenced, - as we'll now see, by certain trends in the British academy-- arose in the thirties and in the forties.

所以实际上,这就是当时美国学术界，受英国学术界影响-,在三四十年代崛起的背景。

耶鲁公开课 - 文学理论导论课程节选

The interesting thing is, actually everyone calls it the Paulson proposal, but it was apparently mostly written by a young man who is in his early thirties You may not consider that young but I think that is young.

有趣的是，虽然每个人都称那个改革为鲍尔森计划，但很明显这个计划大部分是由一个青年男子写的,他才刚刚30岁,也许你们不认为30岁很年轻,但是我觉得是。

耶鲁公开课 - 金融市场课程节选

For almost twenty years, in the nineteen thirties and forties, Fred Allen had a radio show called "Allen's Alley."

VOA: special.2009.03.09

She researched some of the places Darwin visited on his trip on the ship H.M.S.Beagle in the eighteen thirties.

VOA: special.2009.02.27

Ben Bernanke led the central bank through extraordinary efforts to contain the worst economic crisis since the nineteen thirties.

VOA: special.2009.08.28

Most of the songs about this season were written in the nineteen thirties and forties by famous modern composers.

VOA: special.2010.03.15

That is all I know." Here is Billie Holiday singing a popular song of the Nineteen thirties, "More Than You Know."

VOA: special.2010.02.28

These comedies, with plenty of songs, were a popular form of entertainment in the nineteen twenties and nineteen thirties.

VOA: special.2009.02.15

In the late nineteen thirties, he started to collect small pieces of paper including food paper packaging, paper cups and book pages.

VOA: special.2010.04.14

Professor Warren Schmaus of the Illinois Institute of Technology says the union of evolution and genetics only started around the nineteen thirties.

VOA: special.2009.12.01

The verb "to lobby" first appeared in print in the United States in the eighteen thirties, according to a website about Washington.

VOA: special.2010.09.27

He brought attention to singers like Woody Guthrie and Pete Seeger in the nineteen thirties and forties.

VOA: special.2010.01.18

They made many funny movies in the nineteen thirties and nineteen forties that are still popular today.

VOA: special.2009.07.19

In the early nineteen thirties, a music producer, John Hammond, heard Billie Holiday sing in a nightclub.

VOA: special.2011.07.17

Jack Benny became famous nationwide in the nineteen thirties as a result of his weekly radio program.

VOA: special.2009.10.11

Woody Guthrie was a voice for labor unions and striking workers and families beaten down by the Great Depression in the nineteen thirties.

VOA: special.2009.07.27

And the bitterness helped lead to the rise of fascist dictator Adolph Hitler in the nineteen thirties.

VOA: special.2010.11.11

He collected thousands of songs in the nineteen twenties, thirties and forties to save for future generations.

VOA: special.2010.01.25

In the nineteen thirties and nineteen forties, Louis B.Mayer was the most powerful businessman in Hollywood.

VOA: special.2009.05.31

During the nineteen thirties, President Hoover appointed him chief of staff of the Army, one of the most important jobs in the American military.

VOA: special.2010.07.02

This area of the world was a major supplier of these resources in the nineteen thirties.

VOA: special.2011.05.26

He wrote songs for more than fifteen movies from the nineteen thirties to the nineteen fifties.

VOA: special.2009.12.20

The paintings in this exhibit tell an important story about American life during the nineteen thirties.

VOA: special.2009.03.23

In the early nineteen thirties, a music producer,John Hammond, heard Billie Holiday sing in a nightclub.

VOA: special.2010.02.28

Hundreds of thousands of people traveled this Mother Road during the Great Depression of the nineteen-thirties.

VOA: special.2010.01.11

But the father lost his money in the great economic Depression in the nineteen thirties.

VOA: special.2009.11.29

By the nineteen thirties, some of the possible record-making skyscrapers were being designed with spires.

VOA: special.2010.03.31

During the nineteen thirties and forties in Havana, Celia heard many kinds of music.

VOA: special.2009.04.19

For example, the nineteen thirties and forties were called the Golden Age of Radio.

VOA: special.2010.06.06