Scientists in the United States and other countries have been working to explain the mysterious disappearances of bees.

VOA: special.2009.09.22

And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.

科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture.

VOA: special.2009.03.23

While scientists were studying the stars and moon to solve the longitude problem, a man named John Harrison was working on another project.

VOA: special.2010.07.14

Scientists are also working on other plants that either use less water or use it better,or both.

VOA: special.2009.03.23

He and other refugee scientists were worried that Germany was working to develop an atomic bomb.

VOA: special.2009.06.14

Since then, scientists around the world have been working to identify substances gathered from Comet Wild-Two.

VOA: special.2009.09.30

Scientists in the Washington area have been working with keratin, the main substance in poultry feathers.

VOA: special.2010.06.01

Scientists are working to develop crops that can reduce the amount of water used for agriculture.

VOA: special.2009.01.20

Scientists have been working to produce a dependable test for the disease in the living.

VOA: special.2011.02.08

Doctor Nusslein-Volhard says women in Germany often stop working as scientists when have children.

VOA: special.2009.05.13

The president praised scientists working with the Human Genome Project and Celera Genomics Corporation.

VOA: special.2010.07.20

By the nineteen eighties, scientists were working to complete the genome of human beings.

VOA: special.2010.03.23

Scientists are working on vaccines to protect against the new virus.

VOA: special.2009.06.10

He learns about different projects that the scientists are working on.

VOA: special.2009.03.25

Today,chocolate industry officials, activists,and scientists are working with farmers.

VOA: special.2010.02.17

Scientists are working to develop new treatments for MS.

VOA: special.2009.01.06

If all goes well, scientists hope Herschel will be working for three years, and the Planck telescope for about 15 months.

VOA: standard.2009.05.14

He adds that scientists are working with investigators around the world to leverage the investment that went into the soybean for cowpea,chick pea,pigeon pea and other beans.

VOA: standard.2010.02.01

On the other side of town, scientists are working on a genetic test they hope will cut the time it takes to diagnose MDR-TB from 70 days to two days.

VOA: standard.2010.07.12