Officials in Liberia say tens of millions of caterpillars are destroying crops and polluting waterways in the country's agricultural centers.

VOA: special.2009.01.27

Once they have it, and they plant permanent crops, that changes the whole basis of society and the values, and the attitudes that go with it.

一旦他们拥有了土地,他们会栽种长期作物,这就改变了整个社会的物质基础和价值观,以及处理这种问题时的态度

耶鲁公开课 - 古希腊历史简介课程节选

This is something brand new in the world and we shall see how it crops up in different forms and how it shapes the course of Greek history.

公民乃世间一全新产物,我们应透视其是如何以不同的形态产生,以及如何引领希腊历史之路的

耶鲁公开课 - 古希腊历史简介课程节选

Recently we told you about a study of genetically engineered crops and how they have affected farming in the United States.

VOA: special.2010.05.18

The biodiversity has shrunk for various reasons of profitability and as a consequence of that things like corn crops, and the orange crops in Florida are particularly susceptible to certain environmental conditions, certain pests, and certain types of blight.

生物多样性的减少源自利益的驱动,和玉米一样,佛罗里达的柑橘作物很容易受到,一定环境条件的影响,还有虫害和枯萎病

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Based on their research, the experts suggest that farmers plant a variety of crops and not just depend on rice.

VOA: special.2010.03.30

Hard to believe today, but Sicily was one of the major granaries of the Mediterranean world at that time, tremendously fruitful, able to grow the best possible crops, very good wheat and so on.

在今天很难想象,但西西里是当时地中海地区,最主要的粮仓之一,产物丰盛,能够种植最好的谷物,上乘的小麦等等

耶鲁公开课 - 古希腊历史简介课程节选

Roots of Peace supports the planting of native crops and the employment of landmine victims to farm the cleared land.

VOA: special.2010.05.03

Serfs who are compelled to work the land, or in some places even slaves, well, they have no incentive, put aside the question even of capacity, to invest capital for the purpose of improving the size and quality of the their crops, their trees, their vines.

那些被强迫耕种土地的农奴,或者是那些在其他地方直接成为奴隶的人,刨除能动性因素,农场主们,没有任何理由投资钱财,去改善他们农作物,果树和葡萄,的种植规模和品质

耶鲁公开课 - 古希腊历史简介课程节选

It found that many farmers have better harvests, better weed control and fewer losses from insect damage compared to traditional crops.

VOA: special.2010.04.27

And then there would be the butchering of the animal, there would be the securing the crops from the fields, and then bringing it to wherever you were going to eat it, which burns more calories and requires more physical effort, compared to the person on the right that really doesn't have to do much at all.

然后,他们要屠宰动物,要看护好地里的庄稼,还要把食物带到进食的地方,与右边的人相比,他们消耗更多卡路里,需要更强的体力,后者根本不必需付出那么多

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But they also found something else. They say another kind of bug is now attacking the cotton and other crops.

VOA: special.2010.05.25

The researchers point out that gene flow between crops and their wild relatives is common and difficult to contain.

VOA: special.2009.10.27

Agriculture Minister Christopher Toe urged other countries to help save Liberia's crops and other vegetation that the caterpillars feed on.

VOA: special.2009.01.27

Tilling can remove weeds and the waste from last season's crops and help break down old plant material into fertilizer.

VOA: special.2010.09.28

Another animal with a good memory -- the elephant -- often raids field crops, especially maize and cassava.

VOA: special.2010.07.27

Agriculture Report. Plant breeders and genetic engineers keep working to give crops the strength to resist threats like insects,diseases, droughts or floods.

VOA: special.2009.10.27

The study found that many farmers have better harvests, better weed control and fewer losses from insect damage compared to traditional crops.

VOA: special.2010.05.18

He did this while picking crops in the fields and shining people's shoes to earn money to survive.

VOA: special.2010.05.16

He worked in the fields to show farmers new ways to grow wheat, rice and other crops.

VOA: special.2009.09.22

But they arrived too late in the year to plant crops, and their supplies nearly ran out.

VOA: special.2009.08.17

How many hours a day the pump needs to be operated depends on the season and how much water is needed for crops.

VOA: special.2009.08.17

Farmers could not plant crops, because they had no seed and no animals to break the ground.

VOA: special.2010.01.14

They cannot borrow in credit markets and they depend on exports of commodities like crops or minerals.

VOA: special.2009.03.13

Among the plants that can absorb more contaminants, they say,are root crops, leafy vegetables and herbs.

VOA: special.2009.06.09

Weeding,seeding and watering requires at least as much work as crops grown in the open air.

VOA: special.2009.12.22

His work with rice and wheat crops saved millions from starving in Asia and Latin America.

VOA: special.2010.06.22

Borlaug worked in fields to show farmers new ways to grow crops like wheat and rice.

VOA: special.2009.11.10

They had a good water supply in Frijoles Creek and fertile land for growing crops.

VOA: special.2010.07.05

The plant attacks sorghum and other crops and steals water and nutrients from the roots.

VOA: special.2009.06.16