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标题: VOA慢速英语2012.07.24 [打印本页]

作者: Rebecca949    时间: 2012-7-24 11:11     标题: VOA慢速英语2012.07.24

[audio]http://sound.yywz123.com/tingbbs/voa/voa20120724.mp3[/audio]



Yet animals like sheep or goats eat weeds, so they can provide a biological control. Insects and other organisms can also act as biological controls.然而,像绵羊或山羊之类的动物会吃杂草,因此它们可以起到生物控制作用。昆虫和其他生物也可以起到生物控制作用。
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作者: 杨飞飞儿    时间: 2012-7-25 15:04

Providing the spread weeds is any important part of management. Farm ... should be crashed out with weeds. If that is not possible , then clean your ... quickly and your shoes when leaving.
作者: zhant220    时间: 2012-10-7 13:28

Preventing the spread of weeds is an important part of management. Farm vehicles should be crashed out with weeds. If that is not possible , then clean your ... equipment and your shoes when leaving.




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