The breeding of pigs in the farm are all under technology control.
这家农场都是在科技的控制下伺养猪。
Breeding resistance varieties is the most economic and effective way to control the pest.
是我国及世界稻区主要害虫，培育抗性品种是最经济有效的防治手段。
Breeding resistance varieties is the most economic and effective way to control the pest.
是我国及世界稻区主要害虫，培育抗性品种是最经济有效的防治手段。
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