VOA慢速英语2012.07.24 英语, 生物, controls, important, management

Rebecca949

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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zhant220

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.

杨飞飞儿

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.