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Rebecca949 发表于 2012-7-24 11:11

VOA慢速英语2012.07.24

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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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杨飞飞儿 发表于 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.

zhant220 发表于 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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