voa慢速英语讲解附字幕:美味蔬菜-菜花和西兰花2010-03-09
Some people say broccoli looks like small trees, and cauliflower like gathered clouds. They think broccoli is only green and cauliflower is only white. But these nutritious vegetables also come in more colorful versions. One kind of cauliflower, for example, is orange, and broccoli can be purple.
voa慢速英语:大豆基因图谱出炉2010-03-02
Soybeans were first grown in Asia thousands of years ago. Now scientists have a full genetic map of the soybean. This is the first genome completed for a member of the legume family.
voa慢速英语:冬季暴风雪影响华盛顿樱桃树2010-02-23
Official snowfall records for Washington date back to eighteen eighty-four. By early February, this winter had already broken them with one hundred forty-two centimeters of snow measured.
voa慢速英语:Burros Can Do More Than Work Just as Pack Animals2010-02-18
A burro is a small donkey. Another way that people say it is BOOR-oh. The name comes from Spanish and, before that, from a Latin term for a small horse. Donkeys are related to horses. Both are part of the equine family.
[VOA农业报道]Some Crops Can Help Farmers Prepare for Disasters2010-02-09
For example, they can plant crops that are more likely to survive extreme weather. In north-central Vietnam, people with small farms do not plant rice between September and December. Seasonal rains might destroy the rice. So instead, they plant lotus seeds on raised beds. The United Nations Food and Agriculture Organization says the lotus seeds bring a good price in local markets.
voa慢速英语讲解附字幕:抵抗极端环境的几种作物2010-02-09
For example, they can plant crops that are more likely to survive extreme weather. In north-central Vietnam, people with small farms do not plant rice between September and December. Seasonal rains might destroy the rice.
[VOA农业报道]Mapping the Way to a Better Soybean2010-02-03
Soybeans are eaten by people and fed to animals. Some farmers grow them to replace lost nitrogen in the soil.
voa慢速英语讲解附字幕:国际组织致力于扩大非洲的牛疫苗供应2010-02-02
Each year a million cows in Africa die from East Coast fever. The disease is spread by tick bites. Young cows are most at risk; they can die within days. Farmers and herders can lose up to half or more of their calves to East Coast fever.
[VOA农业报道]New Understanding of How Plants Use Water2010-01-26
Scientists have discovered more details about how plants use water. Their findings could help to engineer plants that grow better and more effectively in conditions with higher levels of carbon dioxide.
voa慢速英语讲解附字幕:关于植物利用水的新发现2010-01-26
Scientists have discovered more details about how plants use water. Their findings could help to engineer plants that grow better and more effectively in conditions with higher levels of carbon dioxide.
[VOA农业报道]Giving Grasslands a Rest2010-01-19
Grasslands need time to rest when cattle and other animals feed on them. Moving animals from one area of pasture to another can provide the time needed for new growth. This is called rotational grazing.
voa慢速英语讲解附字幕:让草地休息一下2010-01-19
Grasslands need time to rest when cattle and other animals feed on them. Moving animals from one area of pasture to another can provide the time needed for new growth. This is called rotational grazing.
[VOA农业报道]Keeping Plants and Trees Warm When Temperatures Drop2010-01-15
Florida, in the southeastern United States, is called the Sunshine State. It grows more oranges than anyplace except Brazil. But Arctic air has damaged some Florida oranges and strawberries in recent days, and killed fish at tropical fish farms.
voa慢速英语:气温下降,为植株和树木保暖2010-01-12
Florida, in the southeastern United States, is called the Sunshine State. It grows more oranges than anyplace except Brazil. But Arctic air has damaged some Florida oranges and strawberries in recent days, and killed fish at tropical fish farms.
[VOA农业报道]New Alliance to Study Greenhouse Gases in Agriculture2010-01-07
Experts say that agriculture provides fourteen percent of the world's greenhouse gas emissions each year. The gases released include carbon dioxide, a major cause of global warming.
voa慢速英语:New Alliance to Study Greenhouse Gases in Agriculture2010-01-05
Experts say that agriculture provides fourteen percent of the world's greenhouse gas emissions each year. The gases released include carbon dioxide, a major cause of global warming.
voa慢速英语讲解附字幕:圆形思维:美国农场上的圆形谷仓2009-12-29
American farmers traditionally keep their animals and equipment in barns that are rectangular. But there are hundreds of barns in the Midwest and other parts of the country that are different. They are not longer than they are wide. Or wider than they are long. These buildings are round.
voa慢速英语讲解附字幕:拱形温室怎样延长生长季2009-12-22
Farmers and gardeners have long used greenhouses to extend the growing season in cold weather. Now, hoop houses are gaining popularity. Hoop houses are sometimes called a temporary greenhouse or passive solar greenhouse.
[VOA农业报道]Officials in US Look for Fixes to Carp Problems2009-12-15
The first involves two kinds of Asian carp, bighead and silver. They can grow more than a meter long and weigh up to forty-five kilos. They eat huge amounts of plankton that other fish need to survive. Silver carp can also jump high and hit boaters.
[VOA农业报道]An International Treaty Targets Fishing Abuses2009-12-09
Some pirates catch fish instead of ships. The problem is known as illegal, unreported and unregulated fishing. Such fishing harms the productivity of fisheries, and hurts developing countries especially.
voa慢速英语讲解附字幕:打击过度捕捞的新国际法规2009-12-08
Some pirates catch fish instead of ships. The problem is known as illegal, unreported and unregulated fishing. Such fishing harms the productivity of fisheries, and hurts developing countries especially.
[VOA农业报道]Making Better Concrete With Rice?2009-12-01
Rice hulls, or husks, are the protective coverings on grains of rice. Rice with just its hull removed is brown rice. Rice without its hull or bran is white rice.
voa慢速英语讲解附字幕:用稻壳制造质量更好的水泥2009-12-01
Once rice is harvested, the hulls are out of a job. They may be taken to landfills or burned. Sometimes they are used to absorb waste in chicken houses. Other times they are used to amend soil.
[VOA农业报道]Earl Cooley: Remembering an Early Smokejumper2009-11-24
Years ago, a young forester took an unusual new job. Earl Cooley became one of the first smokejumpers. Smokejumpers parachute from airplanes. They fight fires that crews cannot reach quickly or easily from the ground.
voa慢速英语讲解附字幕:Earl Cooley:纪念一位早期空降消防员2009-11-24
Years ago, a young forester took an unusual new job. Earl Cooley became one of the first smokejumpers. Smokejumpers parachute from airplanes. They fight fires that crews cannot reach quickly or easily from the ground.
 62    1 2 3 下一页 尾页

最新信息