VOA慢速英语2012.12.19
[audio]http://sound.yywz123.com/tingbbs/voa/voa20121219.mp3[/audio]The rising cost of feed has led agricultural research universities to give greater attention to what experts call "feed efficiency." The University of Idaho has a cattle barn where sensors measure exactly how much food each cow eats.养牛成本的增加使得农业研究大学更加关注专家们所谓的"饲养转化效率".爱达荷大学有个牛谷仓,感应器可以精确测量每头牛可以吃多少食物.
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