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1.The biocontrol agent is designed to prevent the spread of disease in crops.
这种生物控制剂旨在防止作物疾病传播。
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2.The researcher found that the natural bacteria could be used as a biocontrol agent against pests.
研究者发现，这种天然细菌可以用作生物防治剂对抗害虫。
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3.The company has developed a new biocontrol agent that can effectively control the growth of weeds in agricultural fields.
该公司开发了一种新的生物控制剂，能有效控制农田杂草的生长。