www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

English 中文網 漫畫網 愛新聞iNews 翻譯論壇
中國網站品牌欄目(頻道)
當前位置: Language Tips> Audio & Video> 新聞播報> Special Speed News VOA慢速

Farmers in East Africa struggle against cassava disease

[ 2010-06-09 12:43]     字號 [] [] []  
免費訂閱30天China Daily雙語新聞手機報:移動用戶編輯短信CD至106580009009

英語學習論壇的“聽力練習區”正式與大家見面啦。歡迎大家來這里練習聽力,交流經驗,共同進步。

本練習區的音頻文件選自英語點津的“聽中國日報”、“VOA常速”、“流行金曲”及“名人演講”等欄目,題材豐富,難度各異,適合不同階段的英語學習者。

英語點津會定期發布音頻材料,大家可以在跟帖中貼出自己聽寫出的音頻文字稿。每個音頻材料的標準文字稿會在帖子發布兩天后公布。

進入該文章的聽寫練習頁面

This is the VOA Special English Agriculture Report.

About 800 million people in Africa, Asia and South America eat cassava. The plant is a major source of food energy and a major food security crop. It can survive in poor soil and without much water. Also, the root can stay in the ground for as long as three years, so it can be harvested as needed.

But in East Africa the plant is under attack. Cassava brown streak disease is a more destructive form of cassava mosaic. The mosaic has been active in East Africa for about 100 years. It limits plant growth. But brown streak can destroy a crop. The virus was identified in Uganda in 2004 and has spread fast in areas extending from Lake Victoria.

So far, brown streak has not jumped to Nigeria, the world's largest producer of cassava. But it threatens more than 30 million tons a year of production in East Africa. In some areas of Uganda, rates of brown streak reached more than 85 percent in 2005 and 2008.

Claude Fauquet is a scientist at the Donald Danforth Plant Science Center in Saint Louis, Missouri. He says a few varieties of cassava can resist brown streak, but these are not the kinds Africans like. He is working to develop disease-resistant plants, but he says it will probably take five years.

Loss of cassava crops could lead to hunger. And hunger can lead to migration and conflict. About 50 million dollars is coming from the Gates Foundation, the Monsanto Fund and the United States Agency for International Development. But Claude Fauquet says much more is needed to fight the disease.

Brown streak can be hard to identify in the field. Irregular yellow spots may appear on lower leaves. But farmers sometimes do not find the disease until they cut open a cassava. If there is only a small amount of rot, the dead material can be cut away. But if the disease has progressed, the whole root is ruined.

Scientists partly blame whiteflies for spreading the disease from plant to plant. Brown streak also spreads if farmers sell or give away cuttings of infected plants.

Cassava has many food uses but the plant is not safe to eat unless it is specially prepared. It must be processed through methods like boiling, grinding or fermenting. A substance that can produce deadly levels of cyanide when eaten must be removed.

And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. I'm Karen Legget.

cassava: a type of flour made from the thick roots of a tropical plant 木薯粉

cassava mosaic: 木薯花葉

cyanide: a highly poisonous chemical compound 氰化物

(來源:VOA 編輯:陳丹妮)

 
中國日報網英語點津版權說明:凡注明來源為“中國日報網英語點津:XXX(署名)”的原創作品,除與中國日報網簽署英語點津內容授權協議的網站外,其他任何網站或單位未經允許不得非法盜鏈、轉載和使用,違者必究。如需使用,請與010-84883631聯系;凡本網注明“來源:XXX(非英語點津)”的作品,均轉載自其它媒體,目的在于傳播更多信息,其他媒體如需轉載,請與稿件來源方聯系,如產生任何問題與本網無關;本網所發布的歌曲、電影片段,版權歸原作者所有,僅供學習與研究,如果侵權,請提供版權證明,以便盡快刪除。
 

關注和訂閱

人氣排行

翻譯服務

中國日報網翻譯工作室

我們提供:媒體、文化、財經法律等專業領域的中英互譯服務
電話:010-84883468
郵件:translate@chinadaily.com.cn
 
 
主站蜘蛛池模板: 欧美性色黄大片在线观看 | 国产中文99视频在线观看 | 久久综合久久88 | 日韩一级影片 | 亚洲精品久久久成人 | 99久久精品久久久久久婷婷 | 亚洲欧美在线看 | 一道本久久 | 亚洲国产高清在线精品一区 | 欧美日韩一区二区在线视频 | 天天澡天天碰天天狠伊人五月 | 国产成人精品日本亚洲专 | 国内精品伊人久久久影视 | 美女被男人cao的爽视频黄 | chinese宾馆自拍hd | 国产免费一区二区三区免费视频 | 二区视频在线 | 91日韩精品天海翼在线观看 | 欧美激情国产一区在线不卡 | 美女曰皮 | 国产欧美日韩视频在线观看一区二区 | vr18成人资源 | 在线午夜影院 | 最近中文在线中文 | 国产视频精品久久 | 国产欧美视频在线观看 | 国产日本欧美高清免费区 | 欧美成人免费网在线观看 | 欧美+日本+国产+在线观看 | 越南高清幻女bbwxxxx | a级片在线观看视频 | 99精品视频在线观看re | 九九国产精品九九 | a毛片毛费观看 | 欧美成人一级视频 | 成人国产精品一级毛片了 | 国产高清晰在线播放 | 成年人免费观看视频网站 | 怡红院免费全部视频在线 | 一区二区三区欧美在线 | 国产a级特黄的片子视频 |