[00:05.12]Cassava is an important food in the diets of more than 500,000,000 people in Africa, Asia and South America. [00:15.70]However, the United Nations Food and Agriculture Organization notes that agricultural development policies [00:24.53]ofte

发表于:2018-12-03 / 阅读(58) / 评论(0) 分类 美国英语听力80篇

By Mario Ritter Broadcast: August 12, 2003 This is Bill White with the VOA Special English Agriculture Report. We often think of agriculture as planting seeds and harvesting crops. But many crops do n

发表于:2018-12-07 / 阅读(52) / 评论(0) 分类 VOA2003(下)-农业与经济

This is the VOA Special English Agriculture Report. These days, if we hear about two different plants being combined, the first thing we think of might is modern biotechnology. But the low-technology process of grafting remains an extremely important

发表于:2018-12-15 / 阅读(51) / 评论(0) 分类 VOA慢速英语2007年(一)月

These stems are filled with soft pith, which containsa sweet juice when the sugar-cane is fully grown and ripe. The plant has long, straight and narrow leaves, and at the top there grows a tassel of rose-coloured flowersabout two feet in length. 甘蔗

发表于:2019-02-13 / 阅读(77) / 评论(0) 分类 英国学生科学读本

Lesson 30 The Potato 第30课 马铃薯 Next to bread, there is perhaps nothing which is so much used for food in our country as the potato. Yet the potato was not known in Great Britain until about three hundred years ago, when it was brought from A

发表于:2019-02-13 / 阅读(47) / 评论(0) 分类 英国学生科学读本

Science and technology 科学技术 Robot plants Putting down roots 植物机器人 落地生根 A robotic model of what plants get up to under the surface 模仿植物根部工作的机器人模型 PEOPLE often forget, when looking at a garden, mead

发表于:2019-02-18 / 阅读(30) / 评论(0) 分类 经济学人科技系列